AM2020/AFP1010 Troubleshooting Guide 50432 Revision A 8/13/97
14
Constant Invalid Reply.
The control panel is trying to poll a device (addressable detector, module, pull
station) at a specific address and is either not receiving any response at all or it
is not receiving a valid response. If two devices are set to the same address, an
invalid reply may not occur immediately.
Note: Under Full System Programming, when a specific NFPA listing (72A, 72B, etc.) is
selected, the AM2020/AFP1010 will automatically program in certain module addresses
(L1M96, L1M97, L1M98, or L1M99). A control module must physically be connected to
the SLC loop at this address, or an invalid reply will occur.
Corrective Action:
The first step in troubleshooting an invalid reply is make sure that the device is
properly programmed into the control panel. Check the following programming
issues:
1) Is the device programmed at the correct address? Check both SLC loop
number and module/detector address.
2) Is the device correctly programmed as a detector or module? Addressable
pull stations and XP Transponder points are considered to be modules.
3) Is the device programmed with the correct type I.D.? If a device is pro
grammed with the wrong type I.D., it may take up to twenty minutes for the
invalid reply to occur.
Note: If the device is an addressable pull station, it can have one of two type I.D.'s. The
BGX-10L is an older pull station which is no longer available, it should be programmed as
a "PULL". The BGX-101L, the most common pull station, must be programmed as an
"MPUL".
4) Once the programming has been verified, check the hardware. Is the device
physically connected to the correct SLC loop?
5) Are the rotary switches on the detector or module set correctly? Address "00"
is not a valid address.
6) Are there two detectors or two modules set to the same address on the same
SLC loop?
7) Does the device physically connected to the SLC loop actually correspond to
what's programmed? Is it a Photoelectric or Ionization detector? Is it a
control or monitor module?
Note: When a control module is programmed as a "CMXC" or an "FORC", the two tabs on
the CMX must be broken.
8) It may be helpful to perform a Walk Test to identify if there is more than one
device at the same address.
The control panel is trying to poll an XP Transponder point at a specific address
and is either not receiving any response at all or it is not receiving a valid
response. Depending on how they are configured, XP Transponders may take
up to 27 addresses (up to 51 for Canadian Dual Stage).
Corrective Action:
The first step in solving an invalid reply problem from an XP Transponder is to
calculate how many addresses the XP Transponder is consuming. Use the work
sheet below to calculate the number of addresses:
If Power Supply Supervision is enabled (XPP switch 1=ON),
it consumes one address (place one in the blank to the right).
___
Invalid Reply From an XP
Transponder Point.
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