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.