GAI-Tronics 378-002 Monitored Input Module (MIM) Station - Manual (Page 4)

Pub. 42004-490A
Model 378-002 Monitored Input Module Station Page 4 of 10
f:\standard ioms - current release\42004 instr. manuals\42004-490a.doc
03/14
Data Communication Line
Terminal blocks TB11 and TB12 are for “feed-thru” connection of the RS-485 data cable. The data cable
should consist of a twisted pair with shield. One end of the data cable must be terminated to the
ADVANCE System Control Cabinet. A total of ten MIM and MRM modules can be parallel wired to the
data cable. The most distant MIM or MRM should have a termination resistor installed across the data
line by installing jumper P2 on the 69248-xxx CPU PCBA.
CAUTION
The RS-485 line is polarity-sensitive. Be sure to maintain circuit polarity throughout installation.
N OTES :
Only one termination resistor should be installed across the RS-485 data line. Be sure jumper P2 is
installed on only the most distant MRM or MIM.
Address Setting
Each MIM and MRM on the RS-485 data line must be set with a unique hardware address. Consult the
System Administrator for the proper address prior to setting the address switch on the MRM or MIM.
Addresses for each module are determined by the System Administrator’s software configuration of the
ADVANCE system. The address is set using the hexadecimal switch on the 69248-xxx CPU PCBA.
Valid addresses are 5-F.
Inputs
The MIM contains eight individually configurable inputs, allowing it to interface with field devices.
Connections with these field devices are made at connectors TB1 through TB8. Each connector
corresponds to a single input (TB1 is used for input #1, TB2 is used for input #2, etc.) Each one of these
inputs may be configured to operate in one of five input modes.
Each input mode requires a unique connection scheme between the external field devices and the
appropriate input connector on the MIM. The connection scheme for each input mode is indicated below.
Since the connection scheme is independent of which input is used, only input #1 will be discussed.
To ensure proper termination, ferrules must be crimped on the end of all conductors that are terminated on
the terminal blocks. The size of the ferrule is dependent upon the size of the conductor used and may be
sourced from any supplier such as Phoenix, Altec or Weidmuller. The terminal blocks may accept
conductors between sizes No. 28 AWG to 12 AWG.
Mode 0: Deactivate Circuit
In this mode, input #1 is not used and is not monitored by the MIM. If this mode is used, no external
connections should be made to connector TB1.