Light Curtain - PLC Programming & Automation

Discrepancy Time on a Dual-Channel Safety Input: What It Protects and How to Pick It

1791ES-IB8XOBV4 terminal strip with a two-contact guard switch: contact one from test output 0 on terminal 4 back to safety input 0 on terminal 2, contact two from test output 1 on terminal 5 back to safety input 1 on terminal 3

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.

Injection Molding Cycle, Barrel Zones and Guard Interlocks

by PLC

Timing chart of one 22.5 s molding cycle: clamp locked from 1.5 s to 18.2 s, injection from 2 s to 3.2 s, hold pressure from 3.2 s to 6.2 s, cooling timer from 6.2 s to 18.2 s with screw rotation from 6.2 s to 12.7 s, mold open position reached at 20.2 s, ejector forward from 20.4 s to 21.4 s, mold closing again at 22.5 s and locked at 24 s

Injection molding from the controls side: the cycle as a state machine, barrel zone PID and thermocouple checks, EUROMAP 67 and 77, guards, and rubber.

PLC Robot Integration: Handshakes, Safety and Cycles

by PLC

Timing chart of a pick cycle handshake between PLC and robot: cell ready stays high, part present rises, the PLC raises start cycle, the robot answers with busy and leaves home, then sets cycle done while the PLC drops start cycle

Map FANUC, ABB and KUKA signals into a PLC, build a pick cycle handshake that cannot drop, select the program by number, and set a sane RPI.