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Driver Error 00008203 (0x0000200b) with MODNET driver when connecting via a gateway

Goals and Symptoms

Summary:
I am using the MODNET driver to communicate with a PLC via an Ethernet gateway and I occasionally get the error "Generic 000012 Driver 00008203 (0x0000200b)" in the I/O Server's syslog.dat file. This also results in a hardware alarm with a description "I/O Device off-line, cannot talk" and my I/O Device going offline. The I/O Device comes back online on its own but I would like to know what is causing this problem and how to avoid it.

Causes and Fixes

Solution:
The Driver Error 00008203 (0x0000200b) maps to Modbus TCP exception "0x0B GATEWAY TARGET DEVICE FAILED TO RESPOND". This means that the gateway is having difficulties communicating with the end device due to the end device being offline, or the gateway having problems servicing the number of requests being sent by the MODNET driver.

There are 2 ways to fix this problem:

1- Disable the 0x0b exception in the gateway. In this case, the MODNET driver will not receive a response from the gateway when the problem occurs and will retry according to the timeout and retry settings set for the driver. You will need to contact the manufacturer of the gateway to know how to do this.

2- Set the following parameters in the citect.ini file:

[MODNET]
TransactionExceptionMask = 0x80000000
OnlineTestExceptionMask = 0xFFFFFBF9

This solution maps the 0x0b exception received by the gateway to a different a lower severity so the I/O device is not taken offline. When the error occurs the pages will still show #COM while the exception is being received but the I/O Device status will remain as online.

Keywords:
Modbus, Gateway, MODNET



Released for: Schneider Electric Saudi Arabia
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