Rockwell Automation 1746-XXXX SLC 500 4-Channel Analog I/O Modules User Manual - Manual (Page 72)

Publication 1746-UM005B-EN-P - June 2004
6-10 Programming Examples
Using Standard Math
Rung 2:0
N7:0 contains percentage of valve open. If this value is
less than 0, move the minimum value to the analog output
(6242 decimal = 4 mA at the analog output).
| Check for Below |
| below range flag |
| range |
| +LES–––––––––––––––+ B3 |
|–+LESS THAN +––––––––––––––––––––––––––––––––+––––( )–––––––––––––––+–|
| |Source A N7:0| | 0 | |
| | 0| | | |
| |Source B 0| | | |
| | | | | |
| +––––––––––––––––––+ | | |
| | Minimum | |
| | analog | |
| | output | |
| | value | |
| | +MOV–––––––––––––––+ | |
| +–+MOVE +–+ |
| |Source 6242| |
| | | |
| |Dest O:2.0| |
| | | |
| +––––––––––––––––––+ |
Rung 2:1
N7:0 contains percentage of valve open. If this value is
greater than 100, move the maximum value to the analog output
(31208 decimal = 20 mA at the analog output).
| Check for Above |
| above range flag |
| range |
| +GRT–––––––––––––––+ B3 |
|–+GREATER THAN +––––––––––––––––––––––––––––––––+––––( )–––––––––––––––+–|
| |Source A N7:0| | 1 | |
| | 0| | | |
| |Source B 100| | | |
| | | | | |
| +––––––––––––––––––+ | | |
| | Minimum | |
| | analog | |
| | output | |
| | value | |
| | +MOV–––––––––––––––+ | |
| +–+MOVE +–+ |
| |Source 31208| |
| | | |
| |Dest O:2.0| |
| | | |
| +––––––––––––––––––+ |
Ladder logic continued on the next page .