Micromod MOD: 1800P - MOD 30ML Identity Module (Version 2) Algorithms, Tables and Sequential Logic Functions - Manual (Page 22)

Logic Functions - Book 2
EXPRESSION BLOCK
8-14
8.2.3 Typical Block Connections for Expression Block
Typical softwiring block structures used on softwiring diagrams are shown in Figure 8-6.
R
Selected Signal R
Input_2
Input_3
VCI3
Result
R
VCI1
Result
Input_1
EX1
Input Selector Example
R
VCI2
Result
SELECT (Input_5)
Input_1
EX1 (BADINP=NO)
Counter Example
R
DI1
Result
R
Result
DI2
EX2 (BADINP=YES)
Count R
RESET (Input_2)
Input_4
Logic to select value
(other expression block)
!RESET * (COUNT +
MOM(Input_1))
COUNT (Input_3)
Selector Example Notes
This example selects
between three inputs by
using another expression
block that produces a
select value. If none of the
three are selected, then
the previous input (input
4) is selected.
Counter Example Notes
This example counts a
digital input with reset
provided by another digital
input. The second
expression block is set up
to keep the first
expression from latching
quality BAD.
(SELECT==1)*Input_1+
(SELECT==2)*Input_2+
(SELECT==3)*Input_3+
(SELECT>1
 SELECT>3) *
Input_4
R
COUNT
COUNT (Input_1)
TIME
GPM (Input 1)
EX1 (BADINP=NO)
Totalizer Example
R
VCI1
Result
R
Result
DI2
TIME (Input 3)
HILIM (Input 2)
EX2 (BADINP=YES)
Totalized Value
R
RESET (Input 2)
!RESET * (TOTAL + GPM * MIN)
MIN (Input 3)
Totalizer Example Notes
This example totalizes an
input (i.e. gpm) with reset
provided by a digital input.
The second expression
block is set up to keep the
first expression from
latching quality BAD.
TOTAL (Input 4)
HLSTAT (Input 1)
LAST (Input 4)
HILIM
High Limit
HLSTAT
High Limit Status
EX3
TIME (Input 1)
TIME
R (HLSTAT * (HILIM - LAST +
TIME) + !HLSTAT * (TIME -
LAST)) / 60000.0
TM1*
Time
Figure 8-6. Typical Block Connections for Expression Block