Inputs I0 and I1 on a 1791ES-IB8XOBV4 went solid red one afternoon with the guard closed, and the DCS instruction in the GuardLogix 5580 behind them has held Input Status false ever since. The guard switch on the infeed has two NC contacts in one four-core cable, the cable was crushed where it enters the … Read more
K1 is a 110 V AC contactor on a saw, its coil is switched by a solid-state relay, the SSR is driven from output pair 0 of a 1791ES-IB8XOBV4, and every 600 ms the contactor makes a small tick you can hear from the door of the panel. The scope on O0+ shows why: the … Read more
Pick a discrepancy time for a 1791ES dual-channel input from the device that drives it, know which setting the DCS instruction sees, and clear the fault.
The 1791ES-IB8XOBV4 on the palletiser cell failed on a Sunday, the spare from stores has the same catalogue number and the same three address switches set to 21, and the yellow triangle over it in the I/O tree has not moved in forty minutes. The GuardLogix 5580 project has a safety signature, the module’s Safety … Read more
The guard on the case packer came off its 440R-S12R2 on a Saturday and went onto a 1791ES-IB8XOBV4 under a GuardLogix 5580, same tongue switch, same two 100S-C09 contactors, and the first time the door was closed the DCS instruction reported Fault Code 16#4000 and would not take a reset. Channel A active, channel B … Read more