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)