GE 8139-SH-DC 126-channel Addressable Smoke and Heat
Short circuit line fault detection can be
enabled with forward or reverse biased test
currents. With forward biased test currents,
the threshold at which a short circuit fault
is reported is configurable up to 1kΩ. With
reverse biased test currents, the threshold is
fixed at 1.95kΩ.
Module operating states
Input “Failsafe” mode
The module supports failsafe mode as defined
in the earlier I/O module introductory section.
Output “Failsafe” mode
The module supports failsafe mode as
defined in the earlier I/O module introductory
section, with the following two additions:
1) Channel using “Configured failsafe values”
In this mode, the module will force the
outputs to predefined levels— defined on a
per channel basis.
On entering “failsafe”:
a) If channel is in Static mode of operation:
Pulse mode is disabled and the channel
is configured as a latched output and is
driven to its failsafe value.
b) If channel is in Dynamic mode of operation:
If in single pulse (momentary) mode, the
configuration is not cleared, but the output
is driven to its failsafe value.
On leaving failsafe:
Channel will adopt the mode defined
below for a channel going from inactive
to active state
2) Channel using “Hold last value”
If the module goes into failsafe during a
single pulse, it is allowed to complete the
pulse before adopting the failsafe state. A
latched (discrete) output will remain at its
current value.
Visual indicators
For the operation of the Power and Fault
LED’s see IO Module Overview.
Channel “Status” LED (yellow)
The yellow “Status” LED reacts in the following
way to module conditions.
For the operation of the Power and Fault
LEDs see the IO Module Overview.

8111-DI-AC
• 8 discrete inputs
• 115 V ac field voltage sources
• User definable input threshold
• Pulse counting option
MODULE SPECIFICATION
See also System Specification
INPUTS
Number of channels
• 8
OFF voltage
• < 34 V ac
ON voltage
• > 84 V ac
Wetting current
• 2 mA (nom.) @ 115 V ac
Maximum input voltage
• 130 V ac
Frequency
• 50 / 60 Hz
CONFIGURABLE PARAMETERS
Selectable input filter
• Fast, slow or user defined
(User defined permits 0 to 512 ms values in 2ms steps)
Latch inputs
• Enable / Disable
Latch polarity
• Latch on high / latch on low
Pulse counting
• Enable / Disable
RESPONSE TIME
I/O response time
• Field event to new data available on Railbus –
33 ms (max.)
POWER SUPPLIES
Railbus (12V) current
• 40 mA (typ.)
• 60 mA (max.)
Bussed Field
• Not required
MECHANICAL
Module Key Code
• E4
Module width
• 42 mm
Weight
• 170 g