Rockwell Automation 1746-NR8 SLC 500 RTD/Resistance Input Module User Manual - Manual (Page 15)

Publication 1746-UM003A-EN-P
Overview 1-5
Resistance Device Compatibility
The table below lists the resistance input types you can use with the RTD
module and gives each type’s associated specifications.
Table 1.3 Resistance Input Specifications
Hardware Overview
The RTD module occupies one slot in an SLC 500:
•
modular system, except the processor slot (0)
•
fixed system expansion chassis (1746-A2)
The module uses eight input words and eight output words for Class 1 and 16
input words and 24 output words for Class 3.
As shown in the illustration below and table that follows, the module contains
a removable terminal block (item 3) providing connection for any mix of eight
RTD sensors or resistance input devices. There are no output channels on the
module. Module configuration is done via the user program. There are no DIP
switches.
Input Type Resistance Range
(0.25 mA Excitation) Resistance Range
(1.0 mA Excitation)
Accuracy (1) Temperature
Drift Resolution Repeatability
Resistance 150
Ω
0
Ω
to 150
Ω
0
Ω
to 150
Ω
(2) ±0.004
Ω
/°C
(±0.002
Ω
/°F)
(3)
0.01
Ω
0.04
Ω
500
Ω
0
Ω
to 500
Ω
0
Ω
to 500
Ω
0.5
Ω
± 0.012
Ω
/°C
(± 0.007
Ω
/°F)
0.1
Ω
0.2
Ω
1000
Ω
0
Ω
to 1000
Ω
0
Ω
to 1000
Ω
1.0
Ω
0.025
Ω
/ C
( 0.014
Ω
/ F)
0.1
Ω
0.2
Ω
3000
Ω
0
Ω
to 3000
Ω
0
Ω
to 1200
Ω
1.5
Ω 0.040
Ω
/ C
( 0.023
Ω
/ F)
0.1
Ω
0.2
Ω
(1) The accuracy values assume that the module was calibrated within the specified temperature range of 0°C to 60°C (32°F to 140°F).
(2) The accuracy for 150
Ω
is dependent on the excitation current: 0.2
Ω
at 0.25 mA and 0.15
Ω
at 1.0 mA
(3) The temperature drift for 150
Ω
is dependent on the excitation current: 0.006
Ω
/°C at 0.25 mA and 0.004
Ω
at 1.0 mA
IMPORTANT
If the RTD module resides in a remote configuration with a
SLC 500 Remote I/O Adapter Module (1747-ASB), use
block transfer for configuration and data retrieval. Block
transfer requires a 1747-SN Remote I/O Scanner (Series B)
or PLC
®
processor.