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PLC Best Practices

Siemens PLC

#20 PLC Best Practices – Identify Critical Alerts

Identify PLC critical alerts and program a trap to monitor the trigger conditions and the alert state for any deviation.

Fixed PLC

#19 PLC Best Practices – Monitor PLC Memory Usage

Measure and provide a baseline for memory usage for every PLC controller deployed in the production environment and trend it on the HMI.

Do’s and Don'ts in PLC

#18 PLC Best Practices – Store PLC Hard Stop Events from Faults

Store PLC hard stop events from faults or shutdowns for retrieval by HMI alarm systems to consult before PLC restarts.

PLC Training Course

#17 PLC Best Practices – Log PLC Uptime and Trend it on HMI

Log PLC uptime to know when it’s been restarted. Trend and log uptime on the HMI for diagnostics.

Types of Scan Time in a PLC

#16 PLC Best Practices – Create Trend for Cycle Time on HMI

Summarize PLC cycle time every 2 to 3 seconds and report to HMI for visualization on a graph using trend.

Allen-Bradley PLC

#15 PLC Best Practices – Safe State when PLC Restarts

Define safe states for the process in case of PLC restarts (e.g., energize contacts, de-energize, keep the previous state).

Types of PLC

#14 PLC Best Practices – Restrict Third-party Data Interfaces

Restrict the type of PLC connections and available data for third-party data interfaces in a programmable logic controller,

Configuration of Siemens Scada and PLC

#12 PLC Best Practices – Validate Inputs based on Physical Plausibility

Ensure operators can only input what’s practical or physically feasible in the process. Learn the PLC’s best rules.

Field Instruments

#11 PLC Best Practices – Instrument for Plausibility Checks

Instrument the process in a way that allows for plausibility checks by cross-checking different measurements.

Free Download PLC Book

#10 PLC Best Practices – Assign Register Blocks by Function

Assign designated register blocks for specific PLC functions in order to validate data and block unauthorized access to controller data.

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