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Function Blocks
3.2.94 SPLIM - Setpoint Limit
SPLIM function blocks can be used on a one per loop
basis to limit the setpoint of the loop controller. Input A
will pass through the function block to output O1 unless it
equals or exceeds the High limit setting or exceeds the
Low limit setting at which time the block will output the
limit value.
If the HI LIMIT is set lower than the LO LIMIT, the block
will always output the high limit value.
Output status HS or LS will be high (1) if the block is in a
limit condition. The status event 'S HI LIM' or 'S LO
LIM' will be displayed in the alphanumeric if the SL
PRIOR is greater than 0. A priority of 0 disables the
reporting of the limit function and sets the bits in the status
word to 0. See below for additional details regarding
priorities.
The SPLIM function block has an RG PTR parameter (input R) that defines the normal operating range of the
block. Limit settings can be made within -10% to 110% of the range pointer values. If the range pointer is not
configured, a range of 0.0 to 100.0 will be used. If a range change is made the current limit value will be moved to
be the same % value within the new range.
PRIORITIES - The priority assigned to SL PRIOR will affect the operation as follows (the outputs HS and LS will
go high with all priority assignments, including 0, when event is active):
1. Bargraphs, event LEDs, and condition will flash. ACK button must be used to stop flashing.
2. Bargraphs, event LEDs, and condition will flash. Flashing will stop if ACK or if event clears.
3. Event LEDs and condition will flash. ACK button must be used to stop flashing.
4. Event LEDs and condition will flash. Flashing will stop if ACK or event clears.
5. Event LEDs and condition will turn on when event is active and off when the event clears.
0. No display action occurs when event is active. The HL and LL status bits are always set to 0.
A
.
3-98
SETPOINT LIMIT
Range
Input A
H I
L
O
S
LO SELECTOR
HI SELECTOR
LO LIMIT
HI LIMIT
BLOCK DIAGRAM
SPLIM
ESN = 000
R
SETPOINT LIMIT
A
R G
P T R
RanGe PoinTeR
(H)
M
L
I
I
T
HIgh LIMIT
........................... Real (100.00)
(S)
L I M I T
LOw LIMIT
........................... Real
(S)
I N
P
U
T
A
.....
INPUT A
loop tag.block tag.output
(H)
L
P
R
I
O
R
Setpt Limit PRIORity
E S N
Exec. Seq. No.
........... 001 to 250
(H)
O1
Output 1
HS
High limit Status
.
LS
Low limit Status
.
UM353-1
O1
Output 1
HS
High Status
LS
Low Status
..
loop tag.block tag
(null)
(0.00)
(null)
.. 0,1,2,3,4,5
(0)
(S)
March 2003
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