Orsl - Override Selector - Siemens 353 User Manual

UM353-1B
3.2.60 OR_ - OR Logic
OR_ function blocks perform a logical OR on the three
inputs. Any unused input will be set low (0).
A
B
C
.
OR TRUTH TABLE
A
0
0
0
0
1
1
1
1

3.2.61 ORSL - Override Selector

ORSL function blocks are used on a one per loop basis
and they enable a primary input signal, such as the output
from a controller, to be overridden by other signals. For a
selector configured as LO, the function block outputs the
lower of the primary or override inputs. For a selector
configured as HI, the function block will output the higher
of the primary or override inputs. Override signals can be
hard limits, coming from HOLD blocks, or signals coming
from other controllers. Block override inputs 1 and 2 can
be used as HI or LO selector functions. Additional
override inputs can be accommodated by connecting these
inputs to signal selector (SEL) blocks.
When the output of the ORSL block is not the primary
input, the output OS will be high (1). In addition, the
block can cause the operator faceplate to display
'OVERRIDE' status when a priority level higher than 0, the default, has been selected.
If an override input is not configured the individual selector will output the other input. When no inputs are
configured, the block will output 0.0 and the OS status will be set low (0).
P
1
.
2
April 2012
OR
B C Output 1
0 0 0
0 1 1
1 0 1
1 1 1
0 0 1
0 1 1
1 0 1
1 1 1
BLOCK DIAGRAM
1
SELECTOR
HI/LO
Override Input 1
Override Input 2
BLOCK DIAGRAM
OR
A
Input A
Input B
B
O1
Input C C
.
I N P U T A
I N P U T B
N P U T
I C
E S N
OVERRIDE SELECTOR
Primary Input P
Override Input 1 1
2
Override Input 2
S E L E C T 1
S E L E C T 2
I N P U T P
I N P U T 1
I N P U T 2
O R P R I O R
E S N
2
SELECTOR
Output 1
HI/LO
Override Status
Function Blocks
OR_ ESN = 000
O1
OR Output 1
INPUT A ..........
loop tag.block tag.output
(H)
INPUT B ..........
loop tag.block tag.output
(H)
INPUT C ..........
(H) loop tag.block tag.output
Exec. Seq. No. ................. 001 to 250
(H)
ESN = 000
ORSL
O1
Output 1
OVERRIDE
SELECTOR
Override Status
OS
......................... LO/HI (LO)
SELECTor 1
(S)
SELECTor 2 ......................... LO/HI
(S)
INPUT P ....... loop tag.block tag.output (null)
(H)
INPUT 1 .......
loop tag.block tag.output (null)
(H)
INPUT 2 ........
(H) loop tag.block tag.output (null)
OverRide PRIORity ....... 0,1,2,3,4,5
(S)
............... 001to 250
Exec. Seq. No.
(H)
O1
OS
.
(null)
(null)
(null)
(HI)
(0)
3-63