CTI 2557 16-Channel RTD Input Module

2557 16-Channel RTD Input Module

The 2557 is a high-speed 16-channel isolated RTD input module designed to be compatible with the 2500 Series® I/O base. The 2557 translates millivolt level signals from the RTD element into a scaled temperature value.

Features

Replaces Siemens® 505-2557

16 bit ADC for each channel

Supports 10Ω copper, 100Ω platinum, and 120Ω nickel RTDs, and millivolt inputs

Advanced preprocessing with on-board scaling

Alarm detection

Filtering and averaging

Fast 20 mSec update time

Open RTD detection and lead resistance compensation

Support for 2. 3. or 4 wire RTD elements

Specifications

Input Channels: 16 RTD or Millivolt inputs

(isolated in groups of 2)

2500 Series PLC System

Description

Product Bulletin

The 2557 is a high-speed 16-channel RTD

input module designed to be compatible with

the CTI 2500 Series or Simatic® 505 I/O

base. The 2557 translates millivolt level

signals from the RTD element into a scaled

temperature value. Multiple RTD types are

supported as well as millivolt inputs. The

module performs scaling, alarm detection,

filtering, peak and valley hold, and averaging.

The standard mode logs in as a 16 WX input

module. The advanced mode logs in as 16 X,

16 Y, 32 WX, and 32 WY registers in the

PLC.

Features

Simatic® 505 I/O base format

1500 V isolation channel-to-PLC

backplane

1500 V isolation channel-to-channel

16 bit ADC for each channel

Supports 10Ω Cu, 100Ω Pt, and 120Ω Ni

RTDs and millivolt inputs

Fast 20 mSec update time

Support for 2. 3. or 4 wire RTD elements

Control Technology Inc.

5734 Middlebrook Pike, Knoxville, TN 37921-5962

RTD Types: 10Ω Cu (TCR= 0.00427 Ω/Ω/°C)

100Ω Pt (TCR= 0.003850 Ω/Ω/°C)

European DIN 43760

120Ω Ni (TCR= 0.00672 Ω/Ω/°C)

2. 3. and 4 wire modes

RTD Excitation Current: 250 micro amp

Millivolt Input Range: 0 to 100 mV

Millivolt Input Impedance: >1000MΩ @ DC

> 10KΩ @ 16 Hz

Millivolt Accuracy:  ± 1.0% full scale or ± 1.0 mV

Lead Compensation: 20Ω per lead wire

Input Overrange Protection: 30 VDC/VAC

Measurement Ranges:

10Ω Cu -100°C to 260°C (-148°F to 500°F)

100Ω Pt -200°C to 850°C (-328°F to 1562°F)

120Ω Ni -80°C to 260°C (-112°F to 500°F)

Measurement Units: Degrees C or F

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 RTD types (16 WX mode)

±0.1°C or °F all RTD types (advanced mode)

Accuracy:

10Ω Cu

(±0.5°C at 25°C) (±1°C from 0° to 60°C)

(±1°F at 25°C) (±2°F from 0° to 60°C)

100Ω Pt

(±0.5°C at 25°C) (±1°C from 0° to 60°C)

(±1°F at 25°C) (±2°F from 0° to 60°C)

120Ω Ni

(±0.5°C at 25°C) (±1°C from 0° to 60°C)

(±1°F at 25°C) (±2°F from 0° to 60°C)

Common Mode Rejection: >130 db @ 60 Hz

Normal Mode Rejection: >180 db @ 60 Hz

Input ESD Protection: 2 Kv

Connector: 64 position fixed, wire press in

Wire Gauge: 18 to 30 AWG

Module Size: Single-wide

Backplane Power Consumption: 6 Watts

Isolation: 1500 VDC channel group to channel

group, 1500 VDC channel to backplane

Operating Temperature: 0° to 60°C (32° to

140°F)

Storage Temperature: -40° to 85°C (-40° to

185°F)

Humidity, Relative: 5% to 95% (non

condensing)