ICS TRIPLEX T8451 processor module

Each ASI module configured for a thermocouple input requires a cold junction reference. Each ASI module can only have one cold junction reference for up to 16 thermocouple inputs. The exception to this is when one of the thermocouple inputs is used as a remote cold junction reference. NOTE: All specifications in FCs 215, 216, and 217 associated with the IMASI13 can be changed during online configuration. When changes are made to the input channel parameters (FC 216), the channel will hold the last value with status unchanged for a short period. This hold time is based on the number of channels that were changed during online configuration, as well as the resolution specified in the FC 216 blocks for that channel. Plan on a hold time of four seconds (worst case) for each FC 216 changed during online configuration. Define one FC 217 in the controller configuration in case ASI module tuning or field calibration operations are needed later.

Calibrating Inputs

 Calibration is done at the factory and the calibration data is stored on the IMASI13 module in nonvolatile memory. No field calibration is necessary. If, however, field calibration is desired, use the procedure described in Field Calibration in this section. Field calibrate the ASI module with the controller by tuning FC 217. Refer to Appendix B for descriptions of FC 215, 216, and 217. It is necessary to define FC 215 and one FC 216 for each input channel in a configuration to field calibrate the ASI module. In addition, when field calibrating the module, the calibration type defined in S4 of FC 217 must be consistent with the input signal type defined in S4 of FC 216. Consider the following examples.

The operator starts, guides

 and ends the field calibration with FC 217. Commands are initiated by tuning this block. The command errors are provided as an output (N+4) of this function block. It reflects the status of the most recently issued calibration command. The status of a channel field calibration is also reported as an output (N+1) of this function block. This output shows the status for the channel referenced in the most recent field calibration command.