Micromod MOD: MODCELL Multiloop Processor 2002N Model C and Associated Hardware - Manual (Page 76)

MODCELL Multiloop Processor
APPENDIX B - SUMMARY OF HARDWARE DIFFERENCES
At least one cold junction compensation input is recommended for each controller to
sense the temperature at the terminal block. The CJIM module, Figure A-1, has been
replaced by a 2009AZ__2__ 2-wire RTD Input Module with RTD sensor as described
in Section 3.5.6 for cold junction compensation. CJIM input specifications are:
COLD JUNCTION COMPENSATION MODULE
Operating range: 0 to 50°C
Overrange: -20 to 70°C
Noise filter: 3 db at 4 Hz
Resolution: 16 bits
Sensitivity: 0.002°C
Accuracy: ±0.5°C
Isolation : 250 Vrms
Figure B-1. Typical Input Circuit for 2010A Cold Junction Compensation Module
+
–
S18
BASE INSTRUMENT LOWER
TERMINAL
HOUSING
1
2
Input
Circuitry
and A/D
Cold
Junction
Sensor
225S2
2010A COLD JUNCTION
COMPENSATION MODULE
(Module Location 18)
Processor
1
2
DATA
SEL
CLK
GND
+5 V 3
6
4
7
5
R
B
B.4 1706S CONFIGURATOR SUPPORT
The MODCELL configurator portion of the 1706S version 5.4 Configuration Software, as
described in IB-23H140, can be used to create (and download) up to a version 3 logic or
version 2 regulatory instrument configuration.
B.5 CURRENT CONSUMPTION FOR MODELS A AND B
The MODCELL Model A and B Instruments have the capacity to handle any mix of I/O that
uses 3.0 amps of current or less. Add the current consumption for each I/O module,
using the planning form in Appendix A, and verify that the total does not exceed 3.0
amps.
7 0