CTI 2557-A 16-Channel RTD Input Module



2557-A 16-Channel RTD Input Module

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

Features

Replaces Siemens® 505-2557. CTI 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

Removeable connectors

SPECIFICATIONS

Classic

Input Channels: 16 RTD or Millivolt inputs

Module Login:

Classic Mode: 16 WX

Classic Plus: 16X, 16Y, 32WX, and 32WY

RTD Types:

10 Ω Cu (TCR= 0.00427 Ω/Ω/°C)

100 Ω 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

Absolute Millivolt Accuracy:

± 1.0% full scale or ± 1.0 mV

Lead Compensation: 20 Ω per lead wire

Input Overrange Protection:

30 VDC or VAC continuous

DESCRIPTION

2500 Series®  PLC System

Product Bulletin

The 2557-A is a high-speed 16-channel RTD input

module designed to be compatible with the 2500 Series

I/O base. The 2557-A translates millivolt level signals

from the RTD element into a scaled temperature value.

Multiple RTD 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. The standard

Classic Mode logs in as a 16 WX input module. The

advanced Classic  Plus Mode logs in as 16 X, 16 Y, 32 WX,

and 32 WY registers in the PLC.

FEATURES

• CTI 2500 Series® and Simatic® 505 I/O base format

• 505 Series 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

• 8 Removable Connectors

Control Technology Inc.

5734 Middlebrook Pike, Knoxville, TN 37921-5962

Phone: +1.865.584.0440    Fax: +1.865.584.5720

www.controltechnology.com

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)

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

ADC Resolution: 16 Bits

Connector: 8 Removable plug-in connectors

(Included with the module)

Wire Gauge: 18 to 30 AWG

Module Size: Single wide

Backplane Power Consumption: 4.75 Watts

Shipping Weight: 1.5lbs. (0.68kg)

Additional Product Information:

Environmental Specifications and UL Agency

Certificates of Compliance are available on our

website.