[foxboro] Read back feature of FBM233 with OPC

Hi list,

the output blocks IOUT, ROUT and PAKOUT work with a read back feature 
in the FBM233. At least they do this when used in an OPC interface.

We connected a Siemens S7 PLC to a FBM233. We found out that it is 
possible to manipulate a value of a ROUT or IOUT block from both sides. 
If the value is changed in the PLC, then it also changes in the ROUT 
block.

We also need some bit values to be set in the PLC or in the I/A system. 
We observe a strange behaviour there:
1) We set bit IN1 in the PAKOUT
2) We set bit #2 in the PLC, and the bit is also set in the PAKOUT. It 
looks the same as bit #1 in the detail display.
3) Then we set IN3 in the PAKOUT. The change made earlier to bit #2 is 
reversed and only IN1 and IN3 are set.

Another strange thing is that if I set IN32, the PAKOUT is frozen and 
no change can be made to it.

I deleted the PAKOUT and put an IOUT to the same OPC address. I made no 
change on the PLC side. Then I could make bit changes on both sides as 
expected and I could also set bit #32.

I/A version is 8.2, the CP is a FCP270.

Is this a configuration error or an error in the PAKOUT block?

Regards,
Joachim Leuker

 
 
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