S7-1200

Wiring a Pt100 into an Analogue Input and Getting Degrees Out: Three-Wire Compensation and the Open-Circuit Reading

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The Pt100 head with its three leads, the 22 m run, and the two terminal strips it lands on: IN-0/A, IN-0/B and RTN-0/C on the 1756-IR6I with the two-wire short drawn dashed, and M+, M-, I+ and I- on the SM 1231 RTD with the bridge the S7-1500 function manual describes

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

Uploading a Program from an S7-1500 Nobody Documented: What Comes Back and What Is Gone

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plc programming upload program undocumented s7 1500 what comes back 1 plc

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

Running an S7-1200 Program in PLCSIM With No Hardware: The Simulated Interface and What Behaves Differently

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plc programming s7 1200 plcsim no hardware what behaves differently 1 plc

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

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