EDWARDS SYSTEMS TECHNOLOGY IRC-3, Programming Manual

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Programming Manual 1.7
Program/System Limits
As in all computer based systems, the IRC-3 network has a finite limit
to the number of items that can be stored in its memory. The network
achieves optimum use of available database memory storage because
each CM1, CM1N, and CM2N panel stores system responses to off
normal conditions of its zones in its own memory. This section provides
you with a method of estimating (calculating) the total memory
requirements of each panel in the network.
The maximum number of zone responses in a CM1N or CM1 is 576,
which includes responses from the ACP, annunciators, and IRC-1
panels. If the number of zone responses in a CM1N exceeds 576, a
CM2N (address = 62) can be added as a data buffer to hold an
additional 576 zone responses. In a single-enclosure system using a
CM1/CM2 configuration, when calculating memory requirements for
the CM1, you must take into account all of the zones on the system
because the CM2 does not have any memory capacity for zone
responses.
Each CM1(N) or CM2N module must be calculated for memory size. It
is most important that the CM1(N) be calculated because its database
information is used to coordinate activity for the entire network as well
as holding its own zone response database. The CM1(N), therefore,
requires the largest database memory space. The CM1(N), as well as
the CM2N modules, have 32K bytes of EEPROM memory available for
database storage. This 32K bytes is a finite limit of each control module
in the network.
The first worksheet will step you through the calculation of memory
usage in a CM1 or CM1N. The second worksheet will step you through
the calculation of memory usage in a CM2N. The CM2 does not
contain memory for zone responses, actions, etc., and therefore does not
require a memory calculation.
Additional System Considerations
Sequences active at any one time: = 256 steps
One step is a [time delay][action] group.
Example: [time delay][action]
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[time delay][action] = 2 steps
"AND" statements programmed: = 256 items
An item is the total number of entries on all of the "AND" statements.
Outputs active at any one time: = 1024 An output is a relay or LED.
Disabled devices/zones (incl. status zones), messages, actions and/or
sequences at any one time: = 832
Device/zone is either a standard zone, sensor, or module.
Time controls active at any one time: = 255
Patrol numbers maximum per patrol list: = 255
Maximum number of active patrol lists (at any one time): = 1
Maximum number of external panel addresses per network: = 28
(CM1NX = 52)
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