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This section describes programming the FACP to function as the head end (master) for a loop of
XA devices connected to the FACP through the XALIC card. When functioning as the head end,
the FACP can monitor the status of all devices and can turn XA output devices on or off.
When programming the FACP as the head end, keep the following guidelines in mind.
XALIC points are logical points used to control and monitor physical XA devices.
The FACP can monitor up to 255 XA devices and control up to 255 XA devices. Since a
FACP IDNet channel (each XALIC corresponds to a channel) can only support 250 devices,
the following FACP
multipoint device types
must be assigned to XALIC points to achieve
the 255 point limit.
TRIAM. Assign this device type to an address within the range 1 through 245 when the
corresponding XA device is an input or input/output device. Each TRIAM point consists
of two subpoints, one that can be used as an output and one that can be used as an input.
RIAM. Assign this device type to an address within the range 1 through 245 when the
corresponding XA device is an output-only device. (XA output-only devices must be at
address 245 or below.)
MLPTIO. Assign this device type to points 246 through 250. These devices support 6
subpoints (for each device, only four subpoints are used).
Program only XALIC addresses that have a corresponding XA device. The XALIC card
performs a configuration check to determine that a corresponding XA device is present at the
programmed XALIC address. If no XA Device is present, an open circuit device trouble is
generated for that device. (Note: the XALIC is unable to detect missing output-only
devices.)
You can determine which XALIC points map to which XA devices by looking at the XALIC
point name. The number in the middle of the XALIC point name corresponds to the number
of the XA device on the connected XA loop.
Figure 13. Interpreting XALIC Point Names
Continued on next page
Programming the FACP as XA Loop Master
Overview and
Guidelines
M2-
2
-1
X
:
2
(where
X
is the XA
loop number)
Examine the XALIC Point name. The middle
number (2 in this case) corresponds to the
similarly numbered XA device on the connected
loop.
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