GAI-Tronics 12578-002 Monitored Input Module (MIM) - Manual (Page 11)

Pub. 42004-711L2B
Model 12578-002 Monitored Input Module (MIM) Page 11 of 12
f:\standard ioms - current release\42004 instr. manuals\42004-711l2b.doc
01/09
Specifications
Electrical
Power requirements ..................................................................................... 9–15 V dc (12 V dc nominal)
Current draw ................................................................. 300 mA maximum @ 12 V dc (no ground faults)
Number of input loops ................................................................................................................... 8 loops
Maximum devices on input loop ................................................................................. Unlimited (Mode 1)
1 (Mode 2)
1 (Mode 3)
Unlimited (Mode 5 - Dry)
1 (Mode 5 – Wet)
Input/output................................................................................................................................. Power in
Power out
RS-485 in
RS-485 out
8 field inputs
Data communications .................................................................................................................... RS-485
RS-485 termination ........................................................................ On board when P2 jumper is installed
End-of-line device ........................................................................................................... 20 k
Ω (Mode 1)
5.1 k
Ω in series with 15 kΩ across contact (Mode 2)
5.1 k
Ω in series with 15 kΩ across contact (Mode 3)
None (Mode 5)
Field Inputs
Mode 1:
Contact closure resistance (activated) ............................................................................... 1 k
Ω maximum
Open Fault Detection....................................................................................................... Minimum 65 k
Ω
Ground Fault Detection .................................................................................... Less than 200
Ω to ground
Modes 2 and 3:
Contact closure resistance (Mode 2: activated/ Mode 3: de-activated) ............................... 3 k
Ω maximum
Open fault detection ........................................................................................................ Minimum 65 k
Ω
Ground fault detection ...................................................................................... Less than 200
Ω to ground
Wire-to-wire short fault detection ..................................................................................... Less than 200
Ω
Mode 5 (Dry)
Contact closure resistance............................................................................................... 900
Ω maximum
Mode 5 (Wet)
DC input voltage range............................................................................... 20–30 V dc (24 V dc nominal)
Limitations:
Cable limitations .................................................................................... 100
Ω maximum loop resistance
Terminals:
Minimum conductor size ...................................................................................... No. 28 AWG (0.5 mm
2
)
Maximum conductor size...................................................................................... No. 12 AWG (3.0 mm 2 )