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)