Fisher FIELDVUE DVC6200f Instruction Manual page 150

Detailed Setup—ISEL Function Block
July 2013
Figure 4‐14. Input Selector Block Limit Propagation
START
No
OP_SELECT
equal to zero?
Yes
Yes
SELECT_TYPE
Average?
No
Yes
SELECT_TYPE
Middle?
No
Yes
SELECT_TYPE
Maximum?
No
Yes
SELECT_TYPE
Minimum?
No
Yes
SELECT_TYPE
First Good or Hot
Spare?
No
Illegal Select Type
should never be reached
148
All inputs with
same limit
status?
No
Propagate
Not Limited
Yes All inputs with
More than 1
same limit
input?
status?
No
No
Propagate
Not Limited
Yes
Input a
constant?
No
Propagate
Input a
Yes
Low Limit
constant?
No
Yes
Propagate
Input a
constant? High Limit
No
NOTES:
1
LIMIT MANIPULATION FOR A CONSTANT INPUT FOR MAXIMUM AND MINIMUM IS BASED
UPON THE FOUNDATION FIELDBUS SPECIFICATION. THE REASONING IS BASED ON HIGH SELECT
PROVIDING A LOW LIMIT STATUS AND LOW SELECT PROVIDING A HIGH LIMIT STATUS.
Propagate
selected input
limit status
Yes
Propagate that
Yes
limit status
Propagate
Constant
1
1
Propagate
selected input
limit status
Instruction Manual
D103412X012