CTI

CTI 2556 16-Channel Isolated Thermocouple Input Module

Posted by ccx

18 9 月, 2026

On 18 9 月, 2026

2556 16-Channel Isolated Thermocouple Input Module

The 2556 is a high-speed 16-channel isolated thermocouple input module designed to be compatible with the 2500 Series® I/O base. The 2556 translates millivolt level signals from the thermocouple element into a scaled temperature value. Multiple thermocouple types are supported as well as millivolt inputs.

Features

Replaces Siemens® 505-2556

16 bit ADC for each channel

Supports J, K, R, S, T, E, L thermocouples and millivolt inputs

Advanced preprocessing with on-board scaling

Alarm detection

Filtering and averaging

Fast 20 mSec update time

Open thermocouple detection

Isolated 1500V channel-to-channel

Isolated 1500V channel-to-PLC backplane

DESCRIPTION

The 2556 is a high-speed 16-channel

thermocouple input module designed to be

compatible with the CTI 2500 Series® and

Simatic® 505 I/O base. The 2556 translates

millivolt level signals from the thermocouple

element into a scaled temperature value.

Multiple thermocouple types are supported as

well as millivolt inputs. Scaling, alarm detection,

filtering, peak and valley hold, and averaging

are supported on a channel-by-channel basis.

All parameters may be loaded into the module

directly with relay ladder logic.

FEATURES

 CTI 2500 Series® and Simatic® 505 I/O base

format

 1500V isolation channel-to-PLC backplane

 1500V isolation channel-to-channel

 Supports J, K, R, S, T, E, and L

thermocouples and millivolt inputs

 Advanced preprocessing with on-board

scaling, alarm detection, filtering and

averaging

 Fast 20 mSec update time

Control Technology Inc.

Millivolt Accuracy: ±0.5% full scale or ±500 µV

Input Overrange Protection:30 VAC/VDC

Measurement Ranges:

J -210°C to +760°C (-350°F to 1400°F)

K -270°C to 1372°C (-450°F to +2500°F)

R, S 0°C to +1768°C (32°F to +3214°F)

T -270°C to +400°C (-450°F to +752°F)

E -270°C to +1000°C (-450°F to +1832°F)

L (DIN J) -210°C to +900°C (-350°F to +1652°F)

Measurement Units:Degrees C or F selectable

Digital Filtering Time Constant:

80 mSec (16 WX mode), 80-6000 mSec

(Advanced mode)

Update Time (all 16 channels):

18 mSec no filtering

20 mSec digital filtering enabled

48 mSec advanced functions enabled

Repeatability: ±0.2°C or °F all thermocouple

types (16 WX mode)

±0.1°C or °F all thermocouple types

(advanced mode)

±50 µV (millivolt inputs)

Accuracy

For measurements above 0°C for types J, K, E,

T, L or above 500°C for types R and S:

Types J, K, E, T, L

±0.5°C at 25°C ambient

±1°C from 0°C to 60°C ambient

0°C to full measurement range

±1°F at 25°C ambient

±2°F from 0°C to 60°C ambient

32°F to full measurement range

For measurements below 0°C or 32°F:

Types R, S

±1°C at 25°C ambient for

measurement range 500-1768°C

±2°C from 0°C to 60°C ambient

±2°F at 25°C ambient

±4°F from 0°C to 60°C ambient

Reduced accuracy for measurements

below 500C

Millivolt Accuracy: ±50 µV from 0°C to 60°C

Millivolt Temperature Drift: 5ppm / °C