CONFIGURATION
CONFIGURATION DATA REQUIRED
4
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19
Loop 2
1. Specification S16 within function code 80 defines the M/A station
as a passive station when set to an address of 254.
2. Specification S23 within function code 80 defines the M/A station
as a basic control station when set to station type 0.
3. Specification S2 (strategic loop controller station, function code
231, fixed block address 900) must be the block address of the M/A
station (function code 80) control output associated with loop 2. It
allows the SLC station block to get loop information from the M/A sta-
tion, and it enables the M/A station faceplate to be placed in auto-
matic or manual control mode.
4. Specification S6 of function code 230 (strategic loop controller I/
O, fixed block address 100) is analog output 2 (AO2), and must there-
fore be associated with the M/A station for loop 2. Manual control of
this output is maintained when the unit enters bypass mode.
Both Loops
On power up, initialization, or return from bypass, loop 1 is the default
loop that is displayed on the faceplate. Loop 2 cannot be activated
unless:
1. It is configured properly (function code 231, S1 = block address of
function code 80, loop 1; S2 = block address of function code 80, loop
2).
and
2. The
CHNG LOOP
soft function key is pressed.
Cascade Operation
The dual loop capability can also be used to display a single output
cascade loop configuration by following these guidelines.
Loop 1 is the primary loop and has no control output. Its PID output is
the external set point to loop 2. The primary loop is also known as the
master or outer loop. There is no control output associated with this
loop.
1. Specification S16 within function code 80 defines the M/A station
as a passive station when set to an address of 254.
2. Specification S23 within function code 80 defines the M/A station
as a basic control station when set to an address of zero.
3. Specification S1 (strategic loop controller station, function code
231, fixed block address 900) is the block address of the M/A station
(function code 80) control output associated with loop 1. It allows the
SLC station block to get loop information from the M/A station, and it
enables the M/A station faceplate to be placed in automatic or manual
control mode.