Chapter
4
Low Alarm Inhibit
In some processes it may be necessary to inhibit the Low Capacity alarm during machine ramp up. Use
the following example to set the low alarm inhibit bit based on a counter.
Rung 3:0
| PANELVIEW | CH'S 1&2 |
| LOW ALARM | MODULE |
| INHIBIT | LOW |
| INDICATOR | INHIBIT |
| | ALARM |
| N10:16 O:4 |
|----] [---------------------------------------------------------------------------------------------------------------( )-----|
| 10 6 |
Rung 2:0
| PRESS IN |
| MOTION BIT |
| N10:21 C5:5 |
|----]/[--------------------------------------------------------------------------------------------------------+--(RES)-----+-|
| 8 | | |
| | PANELVIEW | |
| | LOW ALARM | |
| | INHIBIT | |
| | INDICATOR | |
| | N10:16 | |
| +----(L)-----+ |
|
NOTE:
Use N10:21/8 when using Helm’s resolver module and Helm’s press in motion ladder logic
10 |
or use customer’s own press in motion bit.
Rung 2:1
| PANELVIEW |
| AND CH'S |
| 1&2 MODULE LOW ALARM |
| CAM CYCLE INHIBIT |
| BIT COUNTER |
| N10:21 C5:5 +CTU---------------+ |
|----] [------]/[------------------------------------------------------------------------------------+COUNT UP +-(CU)-|
| 8 DN |Counter C5:5+-(DN) |
| |Preset 4| |
| |Accum 1| |
| +------------------+ |
Rung 2:2
| PRESS IN PANELVIEW |
| MOTION BIT LOW ALARM |
| INHIBIT |
| INDICATOR |
| N10:21 C5:5 N10:16 |
|----] [------] [------------------------------------------------------------------------------------------------------(U)-----|
| 8 DN 10 |
Rung 2:4
MOVES LOW ALARM INHIBIT COUNTS ENTERED FROM PANELVIEW INTO THE PRESET OF THE
LOW ALARM INHIBIT COUNTER
| +MOV---------------+ |
|---------------------------------------------------------------------------------------------------------+MOVE +-|
| |Source N10:17| |
| | 0| |
| |Dest C5:5.PRE| |
| | 4| |
| +------------------+ |
Page 4-11
