A GET on a CPU 1511 that reads from a CPU 1214C and comes back with ERROR = 1 and STATUS = 8 has almost always been refused by the 1214C, and the 1214C has no code in it to blame. Two settings on the partner decide whether PUT and GET ever return data, and … Read more
Pick between TON, TOF and RTO, find out what retentive actually covers on each platform, and stop losing an afternoon to a timer that never times out.
Monitor a block on an S7-1500, build a watch table, and work out why a value sits there: modify against force, optimised blocks, and what STOP does.
Step 2 of a two-step TIA Portal GRAPH sequencer on a CPU 1515-2 PN has been active for 4 minutes 12 seconds by its own S2.T, the transition below it has been satisfied for the last 40 of those seconds, and the sequencer is still sitting on step 2. The heater that step 2 drives … Read more
Zone 3 of the takeaway conveyor stops about once a shift with “Zone3”.Fault latched, the photo-eye on %I4.3 reads a steady 1 in every watch table anybody has opened, and the CPU 1516-3 PN/DP is turning OB1 over in about 6 ms. Whatever is happening is happening inside one of those 6 ms passes, hours … Read more
A CPU 1516-3 PN/DP in RUN on the filler, a SIMATIC memory card behind its front flap, and no project file on any laptop in the building. An S7-1500 upload – online, Upload device as new station (hardware and software) – and about three minutes later an empty project holds the rack, every block with … Read more
A project built for a CPU 1214C DC/DC/DC, no CPU in the building until Thursday, and an S7-1200 PLCSIM instance one toolbar button away. Press it, pick PLCSIM in the PG/PC interface dropdown instead of the wired NIC, and the download that would have gone to 192.168.0.1 over the bench cable goes to a powered-up … Read more
An S7-1500 area length error leaves the CPU in RUN with the ERROR LED on. Read the buffer entry, find the index that runs past the array, fix the order.
Build watch lists in the Studio 5000 Watch window, monitor and write tag values online, and know when the sample rate hides what you are chasing.