7–20 Application Examples
Publication
17476.6 - July 1996
Rung 2:9
This rung checks the analog input data (4–20MA input) to ensure that it is within the proper range
and turns on outputs for under and over range. If the value is within range it is scaled to the
4–20MA analog output range and is then placed into the BTW data area. The BTW enable bit and pending
bits are then latched to initiate the BTW to the analog combination module, output 0. Output 0 is
connected to a meter to display the current range in percent.
| |
| GOOD BTR BELOW |
| DATA BIT RANGE FLAG |
| B3:0 +LES–––––––––––––––+ O:2.0 |
|––] [––+–+LESS THAN +–––––––––––––––––––––––––––––––––––––––––––––––––––––––––(L)–––––+–|
| 2 | |Source A N7:10| 0 | |
| | | 0| | |
| | |Source B 3277| | |
| | | | | |
| | +––––––––––––––––––+ | |
| | | |
| | | |
| | | |
| | ABOVE | |
| | RANGE FLAG | |
| | +GRT–––––––––––––––+ O:2.0 | |
| +–+GREATER THAN +–––––––––––––––––––––––––––––––––––––––––––––––––––––––––(L)–––––+ |
| | |Source A N7:10| 1 | |
| | | 0| | |
| | |Source B 16384| | |
| | | | | |
| | +––––––––––––––––––+ | |
| | +LIM–––––––––––––––+ +SCL–––––––––––––––+ | |
| +–+LIMIT TEST +–+–––––––––––––––––––––––––––––––+SCALE +–+––––––––––+ |
| |Low Lim 3277| | |Source N7:10| | |
| | | | | 0| | |
| |Test N7:10| | |Rate [/10000] 5250| | |
| | 0| | | | | |
| |High Lim 16384| | |Offset 4522| | |
| | | | | | | |
| +––––––––––––––––––+ | |Dest M0:1.210| | |
| | | *| | |
| | +––––––––––––––––––+ | |
| | | SERVICE | |
| | | THE BTW | |
| | | STATUS/ | |
| | BTW ENABLE|BTW DONE BTW | |
| | BIT |BIT PENDING | |
| | M0:1.200 M1:1.200 B3:0 | |
| +––––]/[––––––––]/[–––––+––––(L)––––––––––––+––––––––+ |
| 15 13 | 1 | |
| | | |
| | | |
| | | |
| | | |
| | | |
| | BTW ENABLE | |
| | BIT | |
| | M0:1.200 | |
| +––––(L)––––––––––––+ |
| | 15 | |
| | | |
| | | |
| | B3:0 | |
| |––––––––(U)––––––––| |
| 2 |
| |
| |
| |
Rung 2:10
| |
|––––––––––––––––––––––––––––––––––––––––––––––––+END+–––––––––––––––––––––––––––––––––––––––––––|
| |
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