cybersecurity - PLC Programming & Automation

PLC Data Logging and Remote Monitoring: Practical Rules

Timing chart comparing periodic and change based logging: a one second sample tick, a deadband window where the process value is moving, and the six rows actually written to the database

PLC data logging that stays useful: sampling rates, retention math, a ring buffer in the controller, FactoryTalk datalog, SQL logging, safe remote access.

PLC Industry 4.0: OPC UA, MQTT and Real Data Models

by PLC

Timing chart of an MQTT publish trigger: the broker connection drops and returns, a deadband exceeded pulse and a 30 second heartbeat each raise the publish trigger, and a store and forward flush follows the reconnection

What an Industry 4.0 project really changes on the PLC: the OPC UA server, a UDT to JSON data model, MQTT at the edge, retrofits and security.

PLC Cybersecurity: Hardening a Logix Cell Step by Step

by PLC

Timing chart of a controller restart: run mode drops while the download happens, then the first scan bit pulses, the restart timestamp is written and the unplanned download alarm latches on the SCADA

Zones and conduits, the controller key switch, FactoryTalk Security, firewall rules for 44818 and 502, and a backup you have actually restored.