B855–016 Intrinsically Safe Input, Specifications
(Original Document)
B855-016, Specification Table
Description
12 Vdc intrinsically safe input (true low)
Number of Points
16 isolated
Operating Voltage
11-4-12.6 Vdc
Number of Groups
1
Inputs/group
16
Maximum Input Voltage
Continuous
Continuous
12 Vdc 5%
Surge
500 Vdc for 3 ms
ON State Conditions
100 Ω or less total impedance (3.9 mA @ 12 Vdc)
OFF State Conditions
An open circuit, no less than 100,000 Ω (75 mA) approx. 8.95 V present on + lead
Maximum Response Time
OFF → ON
1 ms
ON → OFF
5 ms
Power Required
+5 V
80 mA
+4.3 V
1.5 mA
-5 V
0 mA
Leakage Current
< 1.5 mA
Wattage Rating on the Module
1.8 W
Maximum Input Voltage @ Source Inputs
Not to exceed 500 Vdc for 3 ms to user source terminals
Module Supply Voltage In
11.4 - 12.6 Vdc, 0.5 A max. load working
80 mA inrush current
Minimum recommended power supply: 1.0 A
Maximum Impedance Limitations
Group
L Inductance
C Capacitance
A & B
80 mH
1.0 mf
C
300 mH
3.0 mf
D
700 mH
8.0 mf
Note: These are Factory Mutual requirements. Please consult with your vendors regarding field devices, wiring, and barriers to ensure compliance.
Terminal Connector
AS-8535-000
Factory Mutual FM 3610
Requires use of key pins and MD-8741-000 barrier strip included with the module
Reference Type
Mapped as 16 bits input
1x
or
Mapped as 1 register input
3x
Input Type
BIN/BCD