Micromod MOD: MODCELL Multiloop Processor 2002N Model C and Associated Hardware - Manual (Page 77)

MODCELL Multiloop Processor
APPENDIX B - SUMMARY OF HARDWARE DIFFERENCES
B.6 MODEL A ICN COMMUNICATION MODULE
The Model A ICN module has no 24V dc supply and is replaced by the Model B ICN
module which does have a 24V dc supply.
If only MODCELL instruments with Model A ICN modules are on the network, the
instrument with the lowest ICN module address automatically terminates. This check is
made each time the ICN is restarted.
NOTE: Whenever the 2001N multiloop processor is placed out of service (when upper
housing is opened), the lower housing should also be opened to prevent the
Model A ICN circuitry from loading down the ICN and causing communications
problems.
Figure B-2. Typical Connection for 2030N Model A ICN Communication Module
COM*
Address Sw
ICN to Other
Instruments
S32
S31
2
BASE INSTRUMENT
2030N Model A ICN
COMMUNICATION
MODULE (Module
Locations 31 and 32)
LOWER
TERMINAL
HOUSING
1
2
1
2
XMIT
13
14
1
3
15
6
4
COM
+
–
5
17
16
10
7
12
11
CLK
DATA
SEL
I/O Bus
Com-
municati
ons
Driver
Receiver
Termi-
nation
Relay
GND
GND
+5
+5
RECV
ENAB
TERM
Note:
ICN Module occupies two slots.
The lower numbered slot provides
the common terminals.
S-3031-26(1)
* Caution
Terminal used for 24V
on Model B
7 1