A first SCL block is two statements long – FC10, for a CPU 1516-3 PN/DP – and the first compile of it comes back with four errors and a warning. Every one of them is a ladder habit typed into a language that reads like Pascal, and the compiler is describing each habit accurately, in … Read more
A CPU 315-2 PN/DP with 6ES7315-2EH14-0AB0 on the label maps to a CPU 1515-2 PN, 6ES7515-2AM01-0AB0, in the Siemens migration guide’s CPU table, and the S7-1500 migration does not happen in one move. It happens in two, the second of which is a right-click on the old CPU in the device view called Migrate to … Read more
A CU240E-2 PN sits on the PROFINET IO system of a CPU 1516-3 PN/DP with G120 telegram 1 in its device view, the PLC is writing 16#047F to the control word and 8192 to the setpoint, and the motor does not move. Bit 6 of the status word is set. That bit is “switching on … Read more
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 Pt100 RTD input wired two-wire over 22 m of 0.5 mm² cable into channel 0 of a 1756-IR6I reads 104.1 °C in a bath that the reference thermometer says is 100.0 °C, and the same sensor with its third lead landed on RTN-0/C reads 100.0 °C. Lift lead A off the module and the … 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 CTU on the end-of-line eye of a takeaway running 0.500 m/s read 12,480 at the end of a shift in which the palletiser stacked 12,116 cartons, and it had been drifting the same way, 2.6% to 3.4% high, for three weeks. Counting cartons was one contact and a counter, and there was nothing wrong … 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
Two PowerFlex 525s with 42.50 Hz on both keypads were running the takeaway at 0.500 m/s and the palletiser infeed it hands over to at 0.462 m/s, and every carton that crossed the transfer between them arrived 7.6% closer to the one in front than it had left. A 1219 mm carton that left the … Read more
A know-how protected OEM block will not open. What TIA Portal still lets you do with it, why the compile error sits in your call, and how to clear it.
A DINT stops at 2147483647, and 27648 multiplied by 77673 is 2147503104. That is the whole of the problem with fixed-point scaling in STL: the arithmetic is exact right up to the statement where it is not, and *D reports the crossing by setting OV and OS rather than by refusing to run. Here is … Read more