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Reading Alarms |
Use a PLC or Block Tag to read alarms from a device, using the parameters described on the next table.
Parameters for reading alarms
N1/B1 |
Address (ID) of a device |
N2/B2 |
1000 |
N3/B3 |
Not used |
N4/B4 |
Alarm number, ranging from 0 (zero) to 31 |
A device provides a reading of 32 alarms, numbered from 0 (zero) to 31, with a status value of 1 for On or 0 for Off.
Use a Block Tag to read multiple alarms, in which each Element represents, sequentially, the status of an alarm, starting with the alarm number defined in the B4 parameter. The next table contains some examples of using Block Tags.
Usage examples of Block Tags
Objective |
Elements |
B1 |
B2 |
B3 |
b4 (initial alarm) |
|---|---|---|---|---|---|
Reading all 32 alarms |
32 |
Device ID |
1000 |
Not used |
0 (zero) |
Reading the first 10 alarms |
10 |
Device ID |
1000 |
Not used |
0 (zero) |
Reading the last 10 alarms |
10 |
Device ID |
1000 |
Not used |
22 |
Reading 5 (five) alarms, starting from alarm 10 |
5 (five) |
Device ID |
1000 |
Not used |
10 |
Use a PLC Tag to individually read the status of the alarm number, between 0 (zero) and 31, defined in the N4 parameter. The next table contains some examples of using PLC Tags.
Usage examples of PLC Tags
Objective |
N1 |
N2 |
N3 |
N4 (alarm number) |
|---|---|---|---|---|
Reading alarm number 14 |
Device ID |
1000 |
Not used |
14 |
Reading alarm number 30 |
Device ID |
1000 |
Not used |
30 |
NOTE |
All alarms are stored in two Words, in registers 0xC000 and 0xC001 of a device's memory. |