3-2
3.1 Precautions Concerning Installation
Noise resistance
The Ethernet is a network used in offices and buildings, where there is comparatively little noise. It does
not have a higher resistance to noise than ordinary FA application networks. Consequently, caution is
required when installing the transceiver and hub, and when laying cables.
Guidelines to noise generation
If any of the following are occurring, there is a danger that external noise is affecting the communication
circuit.
-
The RX LED on the ET-LAN unit is lighted or flashing, whether or not communication is taking place at
the moment.
Cause: External noise from the communication circuit is penetrating the ET-LAN unit and is being
interpreted as a reception signal.
-
An error subsequent to error code 8020H has occurred.
Cause: External noise from the communication circuit is penetrating the ET-LAN unit and is causing a
communication error.
-
An error subsequent to error code A001H has occurred.
Cause: External noise from the communication circuit is penetrating the ET-LAN unit and is causing a
communication error.
Confirm the following items and take any necessary corrective action.
-
Check to see if the RXLED lights or flashes, or if a communication error is occurring, in synch with the
operation of the device.
-
If either of these is happening in synch with the operation of the device, take whatever measures are
necessary to suppress the generation of noise from the device side.
Measures that can be taken in the installation environment
The ET-LAN unit, transceiver, hub, and communication cables should be installed as fast as possible
from high-voltage wires, high-voltage equipment, power lines, power equipment, equipment that
generates strong breaker surges, and the wiring for any of this equipment. At least 100 mm of clearance
should be allowed when installing the equipment.
Содержание FP2 ET-LAN
Страница 11: ...Chapter 1 Unit Functions and Restrictions ...
Страница 14: ...1 4 1 1 4 Connecting to a Network AFP2790 100BASE TX 10BASE T 10BASE5 AUI AFP27901 ...
Страница 24: ...1 14 ...
Страница 25: ...Chapter 2 Names and Functions of Parts ...
Страница 29: ...Chapter 3 Connection for LAN Cable ...
Страница 37: ...Chapter 4 Confirming the Design Contents ...
Страница 49: ...Chapter 5 Initialization Processing and Termination Processing ...
Страница 51: ...5 3 Operation of the ET LAN unit The relationship between initialization processing and open processing ...
Страница 68: ...5 20 ...
Страница 69: ...Chapter 6 Open Processing and Close Processing ...
Страница 71: ...6 3 Operation of the ET LAN unit The relationship between open processing and close processing ...
Страница 84: ...6 16 ...
Страница 85: ...Chapter 7 Computer Link Function ...
Страница 94: ...7 10 Program example ...
Страница 97: ...7 13 Example of communication data Same hierarchy communication ...
Страница 100: ...7 16 Example of communication data Other hierarchy communication ...
Страница 101: ...7 17 Other hierarchy communication for MEWTOCOL COM ...
Страница 102: ...7 18 ...
Страница 103: ...Chapter 8 Data Transfer Function ...
Страница 111: ...8 9 Program example ...
Страница 114: ...8 12 Example of communication data Same hierarchy communication ...
Страница 117: ...8 15 Example of communication data Other hierarchy communication ...
Страница 119: ...8 17 Other hierarchy communication for MEWTOCOL DAT ...
Страница 120: ...8 18 ...
Страница 121: ...Chapter 9 Transparent Communication Function ...
Страница 137: ...9 17 Program example ...
Страница 140: ...9 20 Reception processing After the following program has been run the received data is read from the receive buffer ...
Страница 141: ...9 21 9 5 3 Sample Program Reception to Transmission Program example for transmitting received data as it is ...
Страница 143: ...Chapter 10 Auto Connection ...
Страница 155: ...10 13 Case 1 Ladder program example ...
Страница 169: ...Chapter 11 E mail Function ...
Страница 200: ...11 32 ...
Страница 201: ...Chapter 12 Error Log Function ...
Страница 203: ...12 3 Latest log block area Log block reading processing area ...
Страница 219: ...Chapter 13 Troubleshooting ...
Страница 224: ...13 6 13 2 4 Troubleshooting Flowchart ...
Страница 225: ...13 7 ...
Страница 229: ...Chapter 14 MEWTOCOL Communication Procedure ...
Страница 241: ...14 13 WD Write data area This writes the contents of the data area To write the contents of DT LD and FL ...
Страница 242: ...14 14 To write to an index register ...
Страница 262: ...14 34 ...
Страница 263: ...Chapter 15 Specifications ...
Страница 292: ...15 30 15 6 ASCII Codes ...
Страница 293: ...15 31 15 7 Dimensions AFP2790 FP2 ET1 AFP27901 FP2 ET2 ...
Страница 294: ......
Страница 295: ...Chapter 16 Sample Program ...
Страница 298: ...16 4 ...
Страница 299: ...16 5 ...
Страница 300: ...16 6 ...
Страница 301: ...16 7 ...
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