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Hardware Reference Guide

SST-PFB3-ISA

Loading a Firmware Module

Document Edition: 1.0, Document #: 715-0078, Template Edition: 1.1, Template #: QMS-06-045

Use, duplication or disclosure of this document or any of the information contained herein is subject to the restrictions on page ii of this document.

C.1.3 Testing Card RAM

To test the card’s RAM, follow these steps:

1. Write the upper byte of the desired 20-bit base address to the AddrMatch Register.

2. Write the desired window size to the WinSize register (refer to Section 3.1.5,

WinSize Register

, for details). The default value in the window size is 0x3F.

3. Write 0x40 (MemEn) to the Control Register at offset 1.

4. Fill the shared memory with a test pattern.

Note

We recommend using a test pattern with a unique value for each word in
a given bank. In C, this could be:

~ bank.

5. Repeat steps 3-4 for all memory banks.

6. Verify the test pattern.

Содержание SST-PFB3-ISA

Страница 1: ...SST PFB3 ISA Hardware Reference Guide Document Edition 1 0 Document 715 0078 ...

Страница 2: ...oprietary and confidential property of Woodhead Industries Inc and or its subsidiaries and may not be used or disclosed to others without the express prior written consent of Woodhead Industries Inc and or its subsidiaries SST is a trademark of Woodhead Software Electronics All other trade names are trademarks or registered trademarks of their respective companies At Woodhead we strive to ensure a...

Страница 3: ...d herein is subject to the restrictions on page ii of this document Preface Preface Sections Purpose of this Guide Conventions Warning Only qualified electrical personnel familiar with the construction operation of this equipment and the hazards involved should install adjust operate and or service this equipment Read and understand this guide in its entirety before proceeding Failure to observe t...

Страница 4: ...on of these modules is to enable application level product behavior For more details refer to the firmware reference guide Conventions This guide uses stylistic conventions special terms and special notation to help enhance your understanding Style The following stylistic conventions are used throughout this guide Bold indicates field names button names tab names and options or selections Italics ...

Страница 5: ... card enabling it to respond to commands from the host and manage network communications Host the computer system in which the card is installed ss3 an encrypted firmware module for the card Special Notation The following special notations are used throughout this guide Warning Warning messages alert the reader to situations where personal injury may result Warnings are accompanied by the symbol s...

Страница 6: ...lectronics Division of Woodhead Canada Limited Document Edition 1 0 Document 715 0078 Template Edition 1 1 Template QMS 06 045 Use duplication or disclosure of this document or any of the information contained herein is subject to the restrictions on page ii of this document ...

Страница 7: ...on page ii of this document Contents Preface iii Purpose of this Guide iv Style iv Terminology v Special Notation v Card Overview 9 1 1 Warnings and Cautions 10 1 2 Card Features 11 1 3 Hardware Description 12 1 3 1 DIP Switch 13 1 3 2 LEDs 15 1 3 3 DB9 Connector 17 Installation 19 2 1 System Requirements 20 2 2 Handling Precautions 20 2 3 Installing the Card 21 2 4 Downloading a Firmware Module 2...

Страница 8: ... WinSize Register 33 3 1 6 HostIrq Register 34 3 1 7 LedReg Register 35 3 1 8 Debug Register 36 3 1 9 HDR Register 36 Troubleshooting 37 4 1 COMM LED is Red 38 4 2 Memory Conflict 39 4 3 General Troubleshooting 39 Error Messages 41 A 1 Card Errors 42 A 1 1 HDR Messages 42 A 1 2 Fatal Hardware Self Test Flash Codes 43 Technical Specifications 45 B 1 Technical Specifications 46 Loading a Firmware Mo...

Страница 9: ...ted Document Edition 1 0 Document 715 0078 Template Edition 1 1 Template QMS 06 045 Use duplication or disclosure of this document or any of the information contained herein is subject to the restrictions on page ii of this document 1 Card Overview Chapter Sections Warnings and Cautions Card Features Hardware Description ...

Страница 10: ... or service this equipment Read and understand this guide in its entirety before proceeding Failure to observe this precaution could result in severe bodily injury or in extreme cases loss of life Warning You must provide an external hand wired emergency stop circuit outside the programmable controller circuitry This circuit must disable the system in case of improper operation Uncontrolled machin...

Страница 11: ...f the information contained herein is subject to the restrictions on page ii of this document 1 2 Card Features The SST PBF3 ISA is the next generation Profibus ISA card It can Function as a DP Master Function as a DP Slave Function as a DPV1 Class1 Class2 Master Send and receive FDL layer 2 messages Support simultaneous operation in all of the above modes Support the standard Profibus baud rates ...

Страница 12: ...45 Use duplication or disclosure of this document or any of the information contained herein is subject to the restrictions on page ii of this document 1 3 Hardware Description The main features of the card are described in more detail in the following sections Figure 1 The SST PFB3 ISA Interface Card Table 1 Card Components Feature Description 1 DIP Switch 2 Sys LED 3 COMM LED 4 DB9 Connector 1 2...

Страница 13: ... Note Keep in mind that the card uses 8 I O addresses Selecting I O address 250 actually uses I O addresses 250 through 257 Table 2 DIP Switch Settings A 1 in the following table indicates that a switch is on or UP and a 0 indicates that a switch is off or DOWN The arrow on the switch refer to Figure 2 DIP Switch indicates the direction in which a switch that s off points Port Address Hex 1 2 3 4 ...

Страница 14: ...98 0 1 0 0 1 1 2A0 0 1 0 1 0 0 2A8 0 1 0 1 0 1 2B0 0 1 0 1 1 0 2B8 0 1 0 1 1 1 2C0 0 1 1 0 0 0 2C8 0 1 1 0 0 1 2D0 0 1 1 0 1 0 2D8 0 1 1 0 1 1 2E0 0 1 1 1 0 0 2E8 0 1 1 1 0 1 COM4 2F0 0 1 1 1 1 0 2F8 0 1 1 1 1 1 COM2 600 1 0 0 0 0 0 Game port 608 1 0 0 0 0 1 610 1 0 0 0 1 0 618 1 0 0 0 1 1 620 1 0 0 1 0 0 628 1 0 0 1 0 1 630 1 0 0 1 1 0 638 1 0 0 1 1 1 640 1 0 1 0 0 0 648 1 0 1 0 0 1 650 1 0 1 0 1...

Страница 15: ...this document Port Address Hex 1 2 3 4 5 6 Remarks 6D8 1 1 1 0 1 1 6E0 1 1 1 1 0 0 6E8 1 1 1 1 0 1 COM4 6F0 1 1 1 1 1 0 6F8 1 1 1 1 1 1 COM2 1 3 2 LEDs The LEDs are illustrated in the following diagram and described below Figure 3 Card Mounting Bracket Front View 1 3 2 1 Comm LED The COMM LED indicates the card s communications status Table 3 COMM LED Behavior LED State Meaning Off Card is not onl...

Страница 16: ... LED The Sys LED indicates the card s system status Table 4 Sys LED Behavior LED State Meaning Off Refer to the firmware reference guide Green Refer to the firmware reference guide Red Refer to the firmware reference guide Amber This is the default power up state until the firmware module is running For a list of errors that can occur during power up refer to Section A 1 2 Fatal Hardware Self Test...

Страница 17: ...female connector Pin numbers are identified in the figure below Figure 4 The Profibus DB9 Female Connector Note The recommended male connector is the Brad Harrison PA9D01 42 Diagnostic D Sub Connector Selecting Cable The recommended cable is Belden 3079A Examples include Brad Harrison 85 0001 PVR 2 conductor with shield UL listed Profibus cable Bosch Comnet DP 913 548 Flexible Profibus Cable Bosch...

Страница 18: ... ii of this document Using the Proper Line Type Use this table to determine which line type best suits your system requirements Table 5 Line Types Baud Rate bits s Line A Distance Max Line B Distance Max Total Capacitance of all Drop Cables 19 2k 1200 m 1200 m 15nF 93 75k 1200 m 1200 m 3nF 187 5k 1000 m 600 m 1nF 500k 400 m 200 m 0 6nF 1 5M 200 m NA 0 2nF 3 6 and 12M 100 m NA 0 05nF NA Not Applica...

Страница 19: ... 715 0078 Template Edition 1 1 Template QMS 06 045 Use duplication or disclosure of this document or any of the information contained herein is subject to the restrictions on page ii of this document 2 Installation Chapter Sections System Requirements Handling Precautions Installing the Card Downloading a Firmware Module Connecting to a Profibus Network ...

Страница 20: ...uirements must be met Minimum 8K window in host memory map maximum is 256K and default is 16K An available ISA slot If interrupts are required you will need a physical interrupt 2 2 Handling Precautions The card contains components that are sensitive to electrostatic discharge ESD Do not touch the card without following these precautions Caution Always follow correct ESD procedures before handling...

Страница 21: ...e that all power to your computer is off 2 Adequately ground yourself as explained in Section 2 2 Handling Precautions 3 Unplug the power cord modem if applicable and any network cables 4 Remove the computer cover Consult your computer user s guide for information on installing add in boards 5 Set the DIP switch to the selected address refer to Section 1 3 1 DIP Switch for details 6 Locate a compa...

Страница 22: ... a firmware module to the card refer to Section C 1 Loading a Firmware Module 2 5 Connecting to a Profibus Network This section provides connection termination power and grounding details 2 5 1 Connecting the DB9 The following table describes how to connect the Profibus DB9 Table 6 DB9 Instructions DB9 Pin Description DB9 Pin DB9 Termination with Card Chassis ground 1 Reserved 2 Data 3 Connect thi...

Страница 23: ... Use duplication or disclosure of this document or any of the information contained herein is subject to the restrictions on page ii of this document 2 5 2 Termination Always refer to the Profibus documentation for proper network termination and wiring directions 2 5 3 Power Profibus 5 VDC power is supplied by the card 2 5 4 Grounding Refer to the Profibus network documentation for grounding direc...

Страница 24: ... Electronics Division of Woodhead Canada Limited Document Edition 1 0 Document 715 0078 Template Edition 1 1 Template QMS 06 045 Use duplication or disclosure of this document or any of the information contained herein is subject to the restrictions on page ii of this document ...

Страница 25: ...anada Limited Document Edition 1 0 Document 715 0078 Template Edition 1 1 Template QMS 06 045 Use duplication or disclosure of this document or any of the information contained herein is subject to the restrictions on page ii of this document 3 Hardware Register Details Chapter Sections PFB3 ISA Card Configuration Registers ...

Страница 26: ...or after a physical reset from the system it typically takes 1 second for the card to initialize though it is recommended that applications wait up to 2 seconds Initialization can be confirmed by monitoring the LEDs or by reading the FamilyID register as described in Section C 1 1 Verifying Card Presence Table 7 Host Register Layout The following offsets are from the base address Offset Name 7 6 5...

Страница 27: ...r Bit Descriptions Bit Name Description CardRun This bit controls and indicates whether or not the card s processor is running It also affects the Sys LED When this bit is 0 the processor is halted and the LED is RED When this bit is 1 the processor is running normally and the LED is under card processor control When this bit is 1 and watchdog has timed out processor is halted and the LED is RED T...

Страница 28: ...0 has no effect Reading 1 indicates interrupt in progress Reading 0 indicates interrupt complete CardIrq0 This bit is used by the host to send interrupts to interrupt flag 0 of the card s processor Writing 1 generates an interrupt Writing 0 has no effect Reading 1 indicates interrupt in progress Reading 0 indicates interrupt complete 3 1 3 AddrMatch Register This register controls the card s base ...

Страница 29: ...0xA8 0xA8000 1 0 1 0 1 0 1 0 0xAA 0xAA000 1 0 1 0 1 1 0 0 0xAC 0xAC000 1 0 1 0 1 1 1 0 0xAE 0xAE000 1 0 1 1 0 0 0 0 0xB0 0xB0000 1 0 1 1 0 0 1 0 0xB2 0xB2000 1 0 1 1 0 1 0 0 0xB4 0xB4000 1 0 1 1 0 1 1 0 0xB6 0xB6000 1 0 1 1 1 0 0 0 0xB8 0xB8000 1 0 1 1 1 0 1 0 0xBA 0xBA000 1 0 1 1 1 1 0 0 0xBC 0xBC000 1 0 1 1 1 1 1 0 0xBE 0xBE000 1 1 0 0 0 0 0 0 0xC0 0xC0000 1 1 0 0 0 0 1 0 0xC2 0xC2000 1 1 0 0 0 ...

Страница 30: ... 1 0 0xF6 0xF6000 1 1 1 1 1 0 0 0 0xF8 0xF8000 1 1 1 1 1 0 1 0 0xFA 0xFA000 1 1 1 1 1 1 0 0 0xFC 0xFC000 1 1 1 1 1 1 1 0 0xFE 0xFE000 Table 12 AddrMatch Register Bit Descriptions Bit Name Description AM19 AM12 AM19 AM12 represent the upper address match required to decode memory These bits select the base memory address from 0xA0000 to 0xFE000 For example writing 0xD0 to this register selects 0xD0...

Страница 31: ...fault window size is highlighted and a value of x indicates don t care Bit and Value Window Size and Bank Number BA19 BA18 BA17 BA16 BA15 BA14 BA13 BA12 8k 16k 32k 64k 128k 256k x x 0 0 0 0 0 x 0 0 0 0 0 0 x x 0 0 0 0 1 x 1 0 0 0 0 0 x x 0 0 0 1 0 x 2 1 0 0 0 0 x x 0 0 0 1 1 x 3 1 0 0 0 0 x x 0 0 1 0 0 x 4 2 1 0 0 0 x x 0 0 1 0 1 x 5 2 1 0 0 0 x x 0 0 1 1 0 x 6 3 1 0 0 0 x x 0 0 1 1 1 x 7 3 1 0 0 ...

Страница 32: ...1 1 1 0 x 30 15 7 3 1 0 x x 1 1 1 1 1 x 31 15 7 3 1 0 x don t care Table 15 Bank Address Register Bit Descriptions Bit Name Description BA17 13 The card has 256k of memory accessible to the host The Bank Address bits select which bank of memory the host can access For example in 16k mode the bank number may be 0 through 15 or 0x0 0xf The primary host interface window is located in bank 0 BA17 BA13...

Страница 33: ...inSize Register Settings Bit 7 6 5 4 3 2 1 0 Name WS19 WS18 WS17 WS16 WS15 WS14 WS13 WS12 Read Write R R R W R W R W R W R W R Reset 0 0 0 0 0 0 1 1 Table 17 WinSize Register Values In this table the default window values are highlighted Bit and Value Window Size Description WS19 WS18 WS17 WS16 WS15 WS14 WS13 WS12 0 0 0 0 0 0 0 1 8K AM19 AM13 used AM12 ignored BA19 BA13 used BA12 ignored 0 0 0 0 0...

Страница 34: ...s the number of banks required to access all memory Refer to Table 14 Bank Address Register Values for more information 3 1 6 HostIrq Register This register controls how interrupts from the card are generated Table 19 HostIrq Register Settings Bit 7 6 5 4 3 2 1 0 Name Reserved IrqLevel3 IrqLevel2 IrqLevel1 IrqLevel0 Read Write R R R R RW R W R W R W Reset 0 0 0 0 0 0 0 0 Table 20 HostIrq Register ...

Страница 35: ... Register This register reflects the state of the LEDs allowing host software to monitor the LEDs and display them on screen Table 21 LedReg Register Settings COMM Sys Bit 7 6 5 4 1 0 Name Reserved CommRed CommGrn SysRed SysGrn Read Write R R R R R R Reset 0 0 0 0 0 0 Table 22 LedReg Register Values Bit Name Value Description CommRed CommGrn These bits indicate the state of the communications LED ...

Страница 36: ...sclosure of this document or any of the information contained herein is subject to the restrictions on page ii of this document 3 1 8 Debug Register This register is reserved and must not be accessed by host applications 3 1 9 HDR Register The HDR register shall be used to pass 1 byte of data from the card to the host The use of this register is determined by the firmware module boot code Refer to...

Страница 37: ...he restrictions on page ii of this document 4 Troubleshooting Chapter Sections COMM LED is Red Memory Conflict General Troubleshooting For a list of hardware related errors that can be generated by the card refer to Section A 1 Card Errors Warning Only qualified electrical personnel familiar with the construction and operation of this equipment and the hazards involved should install adjust operat...

Страница 38: ...s section describes strategies for troubleshooting a red COMM LED Note For information on LED flash codes refer to Section A 1 2 Fatal Hardware Self Test Flash Codes If the COMM LED is red the card is not running or there has been a firmware run time error Check the WdTout bit refer to Table 9 Control Register Bit Descriptions to determine whether or not there has been a watchdog timeout and consu...

Страница 39: ... do this in various ways depending on the computer type BIOS and other factors If the computer has a plug and play BIOS you may need to check the plug and play section Note If you see a message stating Disable shadow ram disable this means that the disable of the shadow RAM is disabled Some computers refer to this as Video RAM and others do not allow you to access shadow RAM at all If the computer...

Страница 40: ...re Electronics Division of Woodhead Canada Limited Document Edition 1 0 Document 715 0078 Template Edition 1 1 Template QMS 06 045 Use duplication or disclosure of this document or any of the information contained herein is subject to the restrictions on page ii of this document ...

Страница 41: ...of Woodhead Canada Limited Document Edition 1 0 Document 715 0078 Template Edition 1 1 Template QMS 06 045 Use duplication or disclosure of this document or any of the information contained herein is subject to the restrictions on page ii of this document A Error Messages Appendix Sections Card Errors ...

Страница 42: ...f test A 1 1 HDR Messages If HDR reads anything other than 0x41 the card hasn t been found To fix the problem follow these steps 1 Double check the switch settings and make sure they match up with the I O driver port address setting in the host software application 2 Make sure you have waited up to 2 seconds after the card reset has been negated before trying to access it 3 Check for an I O confli...

Страница 43: ...tact Technical Support Table 23 LED Flash Codes Value Name Description 0x01 BITTEST8 Bit test failure of an 8 bit memory range 0x02 BITTEST16 Bit test failure of a 16 bit memory range 0x03 BITTEST32 Bit test failure of a 32 bit memory range 0x04 ADDRTEST8 Address test failure of an 8 bit memory range 0x05 ADDRTEST16 Address test failure of a 16 bit memory range 0x06 ADDRTEST32 Address test failure...

Страница 44: ...e Electronics Division of Woodhead Canada Limited Document Edition 1 0 Document 715 0078 Template Edition 1 1 Template QMS 06 045 Use duplication or disclosure of this document or any of the information contained herein is subject to the restrictions on page ii of this document ...

Страница 45: ...head Canada Limited Document Edition 1 0 Document 715 0078 Template Edition 1 1 Template QMS 06 045 Use duplication or disclosure of this document or any of the information contained herein is subject to the restrictions on page ii of this document B Technical Specifications Appendix Sections Technical Specifications ...

Страница 46: ...e following tables list the technical specifications for the card Table 24 Environmental Specifications Ambient Conditions Storage temp 40 C to 85 C Operating temp 0 C to 50 C Humidity 5 to 95 non condensing Typical Current Draw 600mA ISA Compliance Compliant with EISA Specification Version 3 12 Table 25 Network Specifications Isolation 1000V Protocol RS485 Data Rate All Profibus data rates up to ...

Страница 47: ...ted Document Edition 1 0 Document 715 0078 Template Edition 1 1 Template QMS 06 045 Use duplication or disclosure of this document or any of the information contained herein is subject to the restrictions on page ii of this document Figure 5 Card Dimensions For information on card components refer to Section 1 3 Hardware Description ...

Страница 48: ...ftware Electronics Division of Woodhead Canada Limited Document Edition 1 0 Document 715 0078 Template Edition 1 1 Template QMS 06 045 Use duplication or disclosure of this document or any of the information contained herein is subject to the restrictions on page ii of this document ...

Страница 49: ...ent 715 0078 Template Edition 1 1 Template QMS 06 045 Use duplication or disclosure of this document or any of the information contained herein is subject to the restrictions on page ii of this document C Loading a Firmware Module Appendix Sections Loading a Firmware Module Note This appendix describes how to load the card manually or how to write your own loader ...

Страница 50: ...r the card or producing a stand alone embedded application the following section describes the basic sequence of steps to manually load a firmware module onto the card Note For register descriptions refer to Chapter 3 Hardware Register Details C 1 1 Verifying Card Presence To verify the card s presence follow these steps 1 Start up your computer 2 Following release of the backplane reset wait at l...

Страница 51: ...r conflicting RAM follow these steps 1 Write zero 0 to the Control Register to disable the card 2 Read a word from the target memory window and save it 3 Write 0xAA55 to the target address 4 Read the target address It should not contain 0xAA55 5 If 0xAA55 is read a conflict exists Perform the following steps Restore the saved value to the target address Abort the load procedure Examine the resourc...

Страница 52: ...ting Card RAM To test the card s RAM follow these steps 1 Write the upper byte of the desired 20 bit base address to the AddrMatch Register 2 Write the desired window size to the WinSize register refer to Section 3 1 5 WinSize Register for details The default value in the window size is 0x3F 3 Write 0x40 MemEn to the Control Register at offset 1 4 Fill the shared memory with a test pattern Note We...

Страница 53: ... the contents of the entire firmware file into shared memory starting at bank zero 0 offset zero 0 2 If the application requires interrupts from the card write the interrupt ID to the HostIrq Register and bit wise OR value 0x20 IntEn to the Control Register 3 Bit wise OR the value 0x80 CardRun to the Control Register to start the firmware module 4 Start a 2 second timeout timer and wait for bit 2 ...

Страница 54: ...oftware Electronics Division of Woodhead Canada Limited Document Edition 1 0 Document 715 0078 Template Edition 1 1 Template QMS 06 045 Use duplication or disclosure of this document or any of the information contained herein is subject to the restrictions on page ii of this document ...

Страница 55: ...f Woodhead Canada Limited Document Edition 1 0 Document 715 0078 Template Edition 1 1 Template QMS 06 045 Use duplication or disclosure of this document or any of the information contained herein is subject to the restrictions on page ii of this document D CE Compliance Appendix Sections CE Compliance ...

Страница 56: ...In a domestic environment this product may cause radio interference in which case you may be required to take adequate measures Caution This equipment is neither designed for nor intended for operation in installations where it is subject to hazardous voltages and hazardous currents Marking of this equipment with the symbol indicates compliance with European Council Directive 89 336 EEC The EMC Di...

Страница 57: ... Limited Document Edition 1 0 Document 715 0078 Template Edition 1 1 Template QMS 06 045 Use duplication or disclosure of this document or any of the information contained herein is subject to the restrictions on page ii of this document E Warranty and Support Appendix Sections Warranty Reference Documents Technical Support ...

Страница 58: ...rranty information pertaining to the card refer to http www mysst com warranty asp E 2 Reference Documents EISA Specification Version 3 12 copyright 1989 1992 BCPR Services Inc E 3 Technical Support Please ensure that you have the following information readily available before calling for technical support Card type and serial number Computer s make model and hardware configuration other cards ins...

Страница 59: ...fice or from http www woodhead com Documentation and software updates are also available on the website Note If you are using the card with a third party application refer to the documentation for that package for information on configuring the software for the card North America Canada Tel 1 519 725 5136 Fax 1 519 725 1515 Email techsupportna woodhead com Europe France Tel 33 0 2 32 96 04 22 Fax ...

Страница 60: ...osure of this document or any of the information contained herein is subject to the restrictions on page ii of this document Asia Pacific Japan Tel 81 452 24 3560 Fax 81 52 745 7622 Email techsupport woodhead co jp Singapore Tel 65 64 67 96 52 Fax 65 6261 3588 Email info woodhead com sg China Tel 86 21 5032 8080 Fax 86 21 5031 8833 Email techsupport woodhead co jp For the most current contact deta...

Страница 61: ...compliance 56 connecting to a Profibus network 22 definition of v dimensions of 47 error messages 42 43 features of 11 hardware 12 installing 21 loading firmware to 50 registers 26 status of 15 System requirements for 20 technical specifications 46 technical support 58 troubleshooting 38 warnings iii 10 37 56 warranty 58 card presence testing for 50 cautions definition of v electrostatic discharge...

Страница 62: ...fatal flash codes 43 LEDs 15 Profibus connector 17 HDR Register 36 HDR error messages and 42 height of card 46 Host Register 26 host definition of v HostIrq Register 34 humidity 46 I I O address 13 installation of card 21 of firmware 50 interrupts 27 34 46 ISA compliance 46 isolation 46 L LedReg Register 35 LEDs description of 15 flash codes 43 status of 35 troubleshooting with 38 line type select...

Страница 63: ... for card installation 20 S specifications for ISA bus 46 ss3 files definition of v status of card 15 of LEDs 35 storage temperature of card 46 support 58 switch 13 Sys LED description of 16 status of 35 System requirements for card 20 T technical specifications 46 technical support 58 temperature operating 46 storage 46 termination for Profibus network 23 testing card presence 50 troubleshooting ...

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