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Series 8 Controller and I/O Specification, S803-150-500
3.3.4.
Low Level Analog (Temperature) Input LLAI
Function
The Low Level Analog Input (LLAI) Module accepts up to 16 channels of temperature inputs from RTD & TC.
Notable Features
TC and RTD operation
Remote Cold Junction compensation capability
1 Second PV scanning with OTD protection
Temperature Support
The Temperature variable is collected from all points at a 1 second rate. The 1 second update includes a
configurable check for Open Thermocouple Detection (OTD) (see below) before propagation of the temperature
variable. All TC inputs include integral Cold Junction Compensation (CJC).
Sampling and Open Sensor Detect
The TC/RTD IOM supports a configuration parameter for Open Sensor Detect before PV delivery. With the
OTD configuration active, the PV is sampled and held while an OTD cycle is performed within the same
measurement window. If the OTD is negative, the PV is propagated up through the system. If the OTD is
positive, the PV is set to NAN and the input channel soft failure is set. In this way, no inappropriate control
action occurs for PV values that are invalid due to an open thermocouple. PV sampling/reporting incurs no
added delays from OTD processing.
Detailed Specification- Low Level Analog Input – RTD & TC (8C-PAIMA1)
Parameter
Input / Output Module
IOTA Modules
Input Type
Voltage Rating
Module current rating
Input Channels
Input scan rate
Channel bandwidth
Nominal input range (TC only)
Maximum normal mode continuous
input non-damaging (any thermocouple
type configured)
Gain error (-20 to +100 millivolt range)
Version 1
Configurable OTD protection (See below)
Temperature points can be added in 16 point
increments
Specification
8C-PAIMA1- Low Level Analog (Temperature) Input, Coated
8C-TAIMA1
Non-Redundant, Coated
Thermocouple and / or RTD
24 VDC
120m A
16 fully-isolated channel-to-channel, channel-to-IOL, and channel-to-
power supply common in 16 channel increments
1 second fixed by IOM, (up to 16 channels/sec max.)
0 to 4.7 Hz (-3 dB)
-20 to +100 millivolts
-10 to +10 volts (TC)
-1 to +2 Volts @ 100 milliamps (RTD)
0.050% full scale max
24
9"
July 2017
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