Low Level Analog (Temperature) Input – LLMUX – CC-PAIM01

Function The LLMUX IOP module facilitates up to 64 channels of temperature inputs. Utilizing the Honeywell PMIO LLMUX FTA, it accommodates both RTD and Thermocouple (TC) inputs. Each FTA supports 16 channels, allowing for flexibility in configuration.

Notable Features

• TC and RTD Operation: Supports both Thermocouple and Resistance Temperature Detector inputs.
• Remote Cold Junction Capability: Enables compensation for TC inputs using Cold Junction Compensation (CJC).
• 1 Second PV Scanning with OTD Protection: Ensures rapid data collection while protecting against Open Thermocouple Detection (OTD).
• Configurable OTD Protection: Allows for customization of OTD detection parameters.
• Temperature Points Incrementation: Temperature points can be added incrementally in sets of 16.

Temperature Support The Temperature Input LLMUX leverages the PMIO LLMUX FTA, which supports RTD and Thermocouple inputs. It collects temperature variables from all points at a rate of 1 second, incorporating OTD checks before propagating the data. TC inputs are compensated using a Cold Junction Compensation (CJT) device.

Sampling and Open Sensor Detect The Temperature multiplexer supports RTD and Thermocouples with Open Sensor Detect functionality before delivering the Process Variable (PV). During an OTD cycle, if detected, the PV is held and assessed. If the OTD is negative, the PV is propagated; if positive, the PV is set to NaN and the input channel undergoes a soft failure process to prevent inappropriate control actions.

Detailed Specs – Low Level Input Multiplexer

Parameter Specification

Input/Output Model: CC PAIM01

PMIO FTA Models: 1 MU-TAMR04, TAMT04, TAMT14

Input Type: Thermocouple and/or RTD

Input Channels: 64 fully-isolated channels, configurable in 16-channel increments

Input Scan Rate: 1 Second (up to 64 channels/sec max.)

Channel Bandwidth: 0 to 4.7 Hz (-3 dB)

Nominal Input Range (TC only): -20 to +100 millivolts

Maximum Normal Mode Continuous Input (any thermocouple type configured):

• -10 to +10 volts (TC)
• -1 to +2 Volts @ 100 milliamps (RTD)

Gain Error (-20 to +100 millivolt range): 0.050% full scale max

Temperature Stability (TC, millivolt inputs/RTD inputs): ±20 ppm per deg C max

Long Term Drift: 500 ppm