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Technical Instructions 

Document No. 155-767 

February 25, 2009 

Modbus RTU Interface Module for SED2 

 

 

 

Siemens Industry, Inc. 

Description 

The Modbus RTU Interface Module for SED2 enables serial communication 
between a Modbus RTU and a SED2 Variable Frequency Drive (VFD).  

Product Part Number 

SED2-MODBUS2 

Contents 

 

MicroGate II Interface module. 

 

Local cable for USS communication with SED2. 

 

Network cable for ModBus communication with Building Automation 
controller. 

 

Installation documentation. 

Required Tools 

Personal computer for configuring device prior to operation. 

Configuration Kit (SED2-MODBUS2_KIT), containing: 

 

 

External Power Supply for the MicroGate II. 

 

9-pin (female) to 9-pin (female) Serial Null Modem Cable. 

 

Installation documentation.

 

 

NOTE: 

Both the Interface Module and the SED2 must be configured prior to 
operation.  

 

Figure 1. 

Summary of Contents for SED2-MODBUS2

Page 1: ...roGate II Interface module Local cable for USS communication with SED2 Network cable for ModBus communication with Building Automation controller Installation documentation Required Tools Personal computer for configuring device prior to operation Configuration Kit SED2 MODBUS2_KIT containing External Power Supply for the MicroGate II 9 pin female to 9 pin female Serial Null Modem Cable Installati...

Page 2: ...serial port from the SED2 See Figure 2 WARNING Do not connect the external 9 Vdc power supply and pin 9 of the LOCAL cable at the same time Programming Switch The Programming PRG Switch on the Interface Module should always be in the RUN position up for normal operations and configuration The PRG position is used strictly for loading firmware at the factory The Interface Module comes with two seri...

Page 3: ...nection type may vary among different installations the cable ends are stripped wires to provide maximum flexibility Figure 4 RS485 Network Cable Figure 5 Four Wire Local Port Cable A four wire cable Figure 5 connects the LOCAL port on the Interface Module to an SED2 The cable ends in stripped wires to facilitate a connection to the SED2 drive terminals shown below CAUTION SED2 drive power should ...

Page 4: ... power Off No power applied to the device Run Mode Flashing Green 250 ms On 250 ms Off Interface Module is operating normally in RUN Mode Configuration Mode Flashing Green 1 5 sec on 1 5 sec Off Interface Module is in CONFIGURATION Mode Fatal Error Flashing Yellow 250 ms On 250 ms Off Interface Module has experienced a fatal error and has halted communication NOTE If the Interface Module has been ...

Page 5: ...9600 bps Data Bits 7 8 8 Parity None Even Odd Even Stop Bits 1 2 1 Changing the Configuration The configuration stored in the Interface Module may be changed from the default configuration by entering CONFIGURATION Mode 1 Attach a configuration cable between the LOCAL port and a serial port on a computer 2 Start a terminal program such as HyperTerminal on the computer and connect using the followi...

Page 6: ...rface Module is in CONFIGURATION Mode it will send its current configuration to the terminal program Figure 9 MicroGate II Configuration Display Table 5 Keyboard Navigation Use the UP and DOWN arrows on the computer keyboard to navigate to the field you want to change Change values with the LEFT and RIGHT arrows Save Configuration Navigate to here and press ENTER to save changes ...

Page 7: ... Table 3 Table 6 SED2 Parameter Settings to Communicate with the MicroGate II SED2 Parameter Function Setting Value P0003 User Access Level 3 Expert Level P0700 0 Command Source 5 if Starting Stopping VFD from Modbus otherwise DO NOT change P1000 0 Frequency Setpoint Source 5 if Setting the Frequency from Modbus otherwise DO NOT change P2009 0 USS Normalization 0 Disabled P2010 0 USS Baud Rate 7 1...

Page 8: ...N 40002 to 1 so that the SED2 stops on loss of communications with the Modbus master To deactivate the Interface Module Host Watchdog Function set WDOG ACTION to 0 SED2 Parameter 2014 USS Telegram Off Time controls a Watchdog timer function for the USS port Once the Interface Module establishes communications with the SED2 if the Interface Module stops communicating with the SED2 the SED2 automati...

Page 9: ...ommunications by issuing a start command from the source and checking the feedback on the Modbus master device to ensure that it reads proper values in the appropriate Registers Modbus Interface Module with Network as Command Source 1 To verify that the Interface Module and SED2 are set up correctly set P0700 0 and P1000 0 to a value of 5 so that the SED2 can be controlled from the Interface Modul...

Page 10: ...om the SED2 Both Registers are scaled so that a value of 4000th represents 100 of the actual frequency FREQ SCALED 40044 contains a scaled version of the HIW data so that a value of 2000 in the register represents the value 4000h in the USS protocol response and 100 of the maximum frequency STW and HSW refer to the 1st and 2nd control words respectively of PZD data included in every poll sent from...

Page 11: ...CT 10 10 0 400 0 P0640 40011 ACCEL TIME SEC 100 0 00 650 00 P1120 40012 DECEL TIME SEC 100 0 00 650 00 P1121 40013 HAND AUTO 1 HAND AUTO P0718 40014 DIGITAL OUT 1 1 ON OFF P0731 40015 DIGITAL OUT 2 1 ON OFF P0732 40016 FREQ MAX HZ 100 1 00 650 00 P2000 40017 PID UP LMT PCT 10 200 00 200 00 P2291 40018 PID LO LMT PCT 10 200 00 200 00 P2292 40019 P GAIN 1000 0 000 65 000 P2280 40020 I GAIN SEC 1 0 6...

Page 12: ...D REV 1 FWD REV ZSW 14 40035 STOP RUN 1 STOP RUN ZSW 2 40036 AT MAX FREQ 1 MAX NO ZSW 10 40037 CONTROL MODE 1 SERIAL LOCAL ZSW 9 40038 ENABLED 1 ON OFF ZSW 0 40039 READU TO RUN 1 READY OFF ZSW 1 40040 ANALOG IN 1 PCT 10 300 0 300 0 r0754 0 40041 ANALOG IN 2 PCT 10 300 0 300 0 r0754 1 40042 ANALOG OUT 1 PCT 10 100 0 100 0 r0774 0 40043 ANALOG OUT 2 PCT 10 100 0 100 0 r0774 1 40044 FREQ ACTUAL PCT 1...

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