CSLS fault detection, system response, and repair procedures

Recording CRCs in a safety instrumented DeltaV system

Note

This information applies to both SLS 1508 and CSLS DeltaV systems.

To record SIS-related CRCs, open DeltaV Diagnostics. The recording of CRCs is identical for CSLS systems and for both SLS 1508 real and simulated systems. DeltaV Diagnostics shows the following CRC values for a logic solver:

Device CRC

An overall CRC for the device CRC generated by the database, containing the actual download script sent to the logic solver.

IOCRC

The value for the combined configuration of all I/O channels as downloaded to the logic solver.

CH_CRC
The value calculated for each individual I/O channel.
LastCRC
The value of the DeviceCRC for the previous download.
FW_CRC
The CRC for a logic solvers firmware image.

In addition to the logic solver CRCs each module assigned to a logic solver has a CRC.

Record the CRCs for every logic solver and assigned SIS module in the system.