RMA
Member
I'm using FB41 in a current projrct to control a Steam Pressure loop. During testing everything seem to be working fine until suddenly the output to the regulator valve went to FFFF (-1) and stayed there. After playing around for a while unsuccessfully I finally deleted the Instance DB and recreated and downloaded it and thereafter everything seemed to be back to normal. Unfortunately, the problem came back again late yesterday afternoon and this time recreating and downloading the Instance DB (and the FB41 block itself) didn't help.
One thing I should mention, the program was created using the customer's Step7 V5.4, but I also did a bit of work at home using Step7 V5.3 before going back to the customer and carring on using V5.4 again. I didn't do any work in the area of the controllers at home though.
Anybody seen anything like this before and more to the point has anybody any ideas how I can get the controller to start working again? This equipment is the customers first time using Siemens for the PLC and since it's destined for Pakistan, to say he's a little worried is major understatement!
One thing I should mention, the program was created using the customer's Step7 V5.4, but I also did a bit of work at home using Step7 V5.3 before going back to the customer and carring on using V5.4 again. I didn't do any work in the area of the controllers at home though.
Anybody seen anything like this before and more to the point has anybody any ideas how I can get the controller to start working again? This equipment is the customers first time using Siemens for the PLC and since it's destined for Pakistan, to say he's a little worried is major understatement!