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Installation and Wiring
2.3 Noise Control Measures
2.3.1 Guidelines to Noise Generation
• If any of the following are occurring, there is a danger that external noise is affecting the
communication circuit. Appropriate measures should be taken.
• Check to see if a communication error is occurring, in synchronization 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.
2.3.2 Taking Corrective Measures through the Application
Communication errors occurring in the unit can be minimized by taking the steps outlined
below. Corrective measures should also be taken on the computer side, such as increasing
the number of times that data is sent.
Increasing the number of times data is sent
• In the tool software FPWIN GR7, select built-in ET-LAN, adjust the "TCP ULP timeout value"
and "TCP re-transmission timer value" in "basic communication information" to increase the
number of times data is sent.
• The number of times data is sent is given in the following formula. "TCP ULP timeout value"
should be specified at an integral multiplication of "TCP re-transmission timer value". When
an integral multiplication cannot be given, round up the given decimal number. The max.
number of times data is sent is 12.
No. of times data is sent = "TCP ULP timeout value (packet existence duration)" / "TCP re-
transmission timer value"
• The above setting is invalid when UDP/IP is used. Use the application to send the
transmission again.
Increasing the timeout judgment time
When master communication commands (SEND/RECV) are executed, select "CPU
configuration" in the tool software FPWIN GR7, and increase the set value for "time settings:
timeout time for communication control commands" Default value is set at 10 seconds (set
value: 100)
REFERENCE
•
For configuration, please see 3.2.1 List of Setting Items.
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