CTI 2551-A 8-Channel Isolated Thermocouple Input Module
2551-A 8-Channel Isolated Thermocouple Input Module
The 2551-A is a high-speed 8-channel isolated thermocouple input module designed to be compatible with the 2500 Series® programmable controller I/O base. The 2551-A translates thermocouple input signals into scaled temperature values and millivolt input signals into equivalent digital words.
Features
Fast 2 mSec update time per channel
Each input configurable for Type J, Type K, or or millivolts
Isolated 1500V channel-to-channel
Isolated 1500V channel-to-PLC backplane
Digital filtering circuit for increased noise immunity
Description
2500 Series® PLC System
Product Bulletin
The 2551-A is a high-speed 8-channel isolated
thermocouple input module de- signed to be
compatible with the CTI 2500 Series® and Simatic®
505 I/O base in local, remote I/O, and Profibus
configurations. The 2551-A translates thermocouple
and millivolt input signals into a scaled temperature
value.
Features
Simatic® 505 I/O base format
1500 V channel-to-channel isolation
1500 V channel-to-PLC backplane isolation
Fast 2 mSec update time per channel
On-board cold junction compensation for each
thermocouple input
Microprocessor self-diagnostics
Millivolt Input: 0 – 55 mV
Digital Filtering Time Constant: 0.3 Sec
Output Units: Degrees C or F,
(jumper selectable for all outputs)
Repeatability: 0.05%
Accuracy: Type J: ±1° from 0° to 760°C
Type K: ±1° from 0° to 1372°C Millivolt: .06 Millivolt
Resolution: 0.3°C, 0.6°F thermocouple input
.020 millivolt input
Common Mode Rejection:
>110db @ 60Hz (digital filtering disabled)
Normal Mode Rejection:
>45db @ 60Hz (digital filtering enabled)
Input ESD Protection: 20.000 V
Overrange Protection: 20 VAC for 1 minute (all input
terminals)
Isolation: 1500 VDC channel-to-channel 1500 VDC
channel-to-PLC
Connector: Fixed
Wire Gauge: 18-24 AWG
Backplane Power: 2.4 Watts
Module Size: Single-wide
Shipping Weight: 1.5 lb (0.68 Kg)