ignition - PLC Programming & Automation

Remote PLC Monitoring and Control Without Open Ports

Ladder rung for a remote write permissive: XIC on Remote_Session in series with XIO on the Local_Only key switch and XIO on WDog_Fault, driving the Remote_Write_OK coil

Remote access to a PLC that security will sign off: outbound VPN routers, read-only web HMI, an access rights table, a permissive rung and an audit trail.

SCADA PLC Integration: Connect Ignition to ControlLogix

by PLC

Timing chart of a one second SCADA tag group: the group tick, the CIP read request, the controller reply about 60 ms later, and the historian insert

Pick the protocol, prepare the controller tags, add the device in Ignition, set a sane tag group, then prove the link survives a network drop.

IIoT PLC Data with MQTT, Sparkplug B and an Edge Gateway

by PLC

Timing chart comparing a fixed one second poll against report by exception, where the gateway publishes only when the tag moves past its deadband

A working IIoT setup for a plant floor PLC: edge gateway choice, MQTT and Sparkplug B topics, a decoded payload, store and forward, deadbands and security.

OPC UA PLC Integration: From PLC Tag to SCADA Client

by PLC

Timing chart of an OPC UA subscription showing 250 ms sampling pulses, a PLC tag value change, and notifications leaving at the 1 second publishing interval

Connect a PLC to SCADA with OPC UA: KEPServerEX channels, the S7-1500 built-in server, certificate trust, subscription rates and why OPC DA kept breaking.