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<== Date ==> <== Thread ==>

Subject: Modbus disconnecting
From: Alex Wallace <awallace@slac.stanford.edu>
To: tech-talk@aps.anl.gov
Date: Fri, 10 Jan 2014 17:35:19 -0800
Hi,

I know this is a fairly vague problem, but I figured I'd ask to see if there are somethings I might not be thinking of. We've recently had a problem where some of my modbus ports lose their connection to the PLC. Currently running 2.4.0 of Mark River's modbus module. Nothing has changed in the configuration and this has been working for a long period of time. Here's what we get from the IOC log:

[Jan 09 12:32:47] 2014/01/09 12:32:47.157 drvModbusAsyn::doModbusIO port K2_Yn_Out_Bit error calling writeRead, error=plc-xpp-lss.pcdsn:502 timeout: Resource temporarily unavailable, nwrite=6/6, nread=0 [Jan 09 12:58:21] 2014/01/09 12:58:21.098 drvModbusAsyn::doModbusIO port XPP_Yn_Out_Bit error calling writeRead, error=plc-xpp-vac02:502 timeout: Resource temporarily unavailable, nwrite=6/6, nread=0 [Jan 09 12:58:22] 2014/01/09 12:58:22.547 drvModbusAsyn::doModbusIO port K2_Yn_Out_Bit error calling writeRead, error=plc-xpp-lss.pcdsn:502 timeout: Resource temporarily unavailable, nwrite=6/6, nread=0 [Jan 09 12:58:23] 2014/01/09 12:58:23.198 drvModbusAsyn::doModbusIO port XPP_Cn_In_Bit error calling writeRead, error=plc-xpp-vac02:502 timeout: Resource temporarily unavailable, nwrite=6/6, nread=0 [Jan 09 12:58:25] 2014/01/09 12:58:25.547 drvModbusAsyn::doModbusIO port K2_Cn_In_Bit error calling writeRead, error=plc-xpp-lss.pcdsn:502 timeout: Resource temporarily unavailable, nwrite=6/6, nread=0 [Jan 09 15:13:52] 2014/01/09 15:13:52.351 drvModbusAsyn::doModbusIO port XPP_Xn_Bit error calling writeRead, error=plc-xpp-vac02:502 timeout: Resource temporarily unavailable, nwrite=6/6, nread=0 [Jan 09 15:13:54] 2014/01/09 15:13:54.051 drvModbusAsyn::doModbusIO port K2_Xn_Bit error calling writeRead, error=plc-xpp-lss.pcdsn:502 timeout: Resource temporarily unavailable, nwrite=6/6, nread=0 [Jan 09 15:13:54] 2014/01/09 15:13:54.452 drvModbusAsyn::doModbusIO port XPP_Yn_Out_Bit error calling writeRead, error=plc-xpp-vac02:502 timeout: Resource temporarily unavailable, nwrite=6/6, nread=0 [Jan 09 15:13:56] 2014/01/09 15:13:56.552 drvModbusAsyn::doModbusIO port XPP_Cn_In_Bit error calling writeRead, error=plc-xpp-vac02:502 timeout: Resource temporarily unavailable, nwrite=6/6, nread=0 [Jan 09 15:14:01] 2014/01/09 15:14:01.414 drvModbusAsyn::doModbusIO port XPP_Yn_Out_Bit error calling writeRead, error=plc-xpp-vac02:502 timeout: Resource temporarily unavailable, nwrite=6/6, nread=0 [Jan 09 15:14:02] 2014/01/09 15:14:02.046 drvModbusAsyn::doModbusIO port K2_Yn_Out_Bit error calling writeRead, error=plc-xpp-lss.pcdsn:502 timeout: Resource temporarily unavailable, nwrite=6/6, nread=0 [Jan 09 15:14:05] 2014/01/09 15:14:05.046 drvModbusAsyn::doModbusIO port K2_Cn_In_Bit error calling writeRead, error=plc-xpp-lss.pcdsn:502 timeout: Resource temporarily unavailable, nwrite=6/6, nread=0 [Jan 09 15:14:11] 2014/01/09 15:14:11.369 drvModbusAsyn::doModbusIO port XPP_Xn_Bit error calling writeRead, error=plc-xpp-vac02:502 timeout: Resource temporarily unavailable, nwrite=6/6, nread=0 [Jan 09 15:14:13] 2014/01/09 15:14:13.048 drvModbusAsyn::doModbusIO port K2_Cn_In_Bit error calling writeRead, error=plc-xpp-lss.pcdsn:502 timeout: Resource temporarily unavailable, nwrite=6/6, nread=0 [Jan 09 15:16:07] 2014/01/09 15:16:07.250 drvModbusAsyn::doModbusIO port XPP_Yn_Out_Bit error calling writeRead, error=plc-xpp-vac02:502 timeout: Resource temporarily unavailable, nwrite=6/6, nread=0 [Jan 09 15:16:09] 2014/01/09 15:16:09.351 drvModbusAsyn::doModbusIO port XPP_Cn_In_Bit error calling writeRead, error=plc-xpp-vac02:502 timeout: Resource temporarily unavailable, nwrite=6/6, nread=0 [Jan 09 15:16:11] 2014/01/09 15:16:11.451 drvModbusAsyn::doModbusIO port XPP_Xn_Bit error calling writeRead, error=plc-xpp-vac02:502 timeout: Resource temporarily unavailable, nwrite=6/6, nread=0


Any ideas?

Thanks

--
Alex Wallace
Control Systems Engineering
RED Controls & Data Systems
Bldg. 901 Room 130B
ext. 3516
cell (925)785-4338


Replies:
RE: Modbus disconnecting Mark Rivers

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