86 NFS2-3030 Operations Manual — P/N 52546:N1 06/20//2014
Section C: Factory Mutual Applications
The FMM-4-20:
The FMM-4-20 is intended for use in intelligent, two-wire systems, allowing Control Panels to
interface and monitor two-wire or three-wire sensors with a 4-20 mA signal.
The FMM-4-20 monitor can be used in FlashScan mode only. CLIP mode operation will generate a
trouble message at the panel.
The following is a list of troubles that can occur on the FMM-4-20. For further information and
suggested action to evaluate these troubles, refer to Section 2.3 on page 27.
NOTE: Factory Mutual (FM) Approval does not include or imply Approval of gas detector heads
or other apparatus to which the FMM-4-20 may be connected. In order to maintain an FM
Approved system, the sensor to which the FMM-4-20 is connected must also be FM approved.
NOTE: The FMM-4-20 is compatible for display at the NCA-2 and ONYXWorks.
Trouble: Description:
DEVICE INHIBIT The FMM-4-20 is in a self-calibration state.
DUAL ADDRESS There is more than one device with the same SLC address.
INVALID RESPONSE The device has returned a response to the panel that the
panel did not expect.
MISMAT HDWE TYPE The programming information in the panel’s database does
not match the device at the address specified.
MOD EXT PWR LOSS The module has lost external power.
NO ANSWER The device is not responding to the poll.
NO THRESHOLDS PROGRAMMED No threshold values have been programmed for the FMM-
4-20.
OPEN CIRCUIT The module has an open circuit on it’s supervised wiring.
OVER RANGE The FMM-4-20’s 4-20 mA sensor has exceeded 20 mA.
SHORT CIRCUIT The module has a short circuit on it’s supervised wiring.
TROUBLE1 An FMM-4-20 module threshold trouble as determined in
point programming.
TROUBLE2 An FMM-4-20 module threshold trouble as determined in
point programming.
UNDER RANGE The FMM-4-20’s 4-20 mA sensor has dropped below 4
mA.
NOTE: If the FMM-4-20 is monitoring a sensor that supports the Device Inhibit condition, it is
recommended that the user program one of the 4-20 mA thresholds to support this condition.
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