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Example with unit address 200:
"AID200;E._)(
,
I~B ,5,X
"
"AID200;X"
8.9.
SCAN FUNCTION
Execute on "X"
mode,
initiate block operation and execute
the first, block-memory position.
Execution of second position etc. up to and including block
position 5.
(Available only in some slave units)
The scan function is used for the sequential select of inputs, switches, channels. A
scan-cycle can be executed over channels of several units on the condition that:
All units are of the same PM-number.
All units are set for the same operating mode (see the System 21 manual and
the operating cards of the slave units)
.
No unit is in Execute Unconditional mode (see 8.5)
.
The units have
successive-addres.~s
-
with settings starting at 0.
The scan is initiated by the command
"AID
nnn ;l
s;;,'
~h~te'
rtnn
r,
e p~e.sents
the
slave address. The execution
is
done with a number of execute commands or
triggers equal to the number of channels to be scanned. Under the above
conditions
a scan cycle will start with the lowest channel number of the unit with
address-switch set to zero and continue along all channels and units. A scan
,
once
initiated, may not be followed by other than execution commands. All other
commands will
cancel the scan.
Example:
"AID200;E._)(
,
I~S
"
"AID201;E._)(,I~S"
"AID202
;
E._)(,I~S
"
Repetitively:
"AID ;XCU 20
"
Initiate a scan on PM2120 units with
addresses
200,
201 and 202.
Execute to all PM2120 units. The scan starts with
lowest channel of unit
200,
and steps along all
channels with the successive execute commands.
11
- Quick Links:
- How to Interconnect the Units
- Annex
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