The data available in SSR4 register is located by default at address 40131. The bit values in SSR4 are Modbus client dependent.
Bits 0...15 in the SSR4 register correspond to different data categories in the regular Modbus memory map. Bit 0 corresponds to data category 1, bit 1 to data category 2 and so on.
If a bit is set to "1", some data belonging to the category in question has changed since the client last scanned the register. The SSR4 bit or bits are cleared when the register is read.
The data category number for all Modbus data is shown in the Modbus memory map. The meaning of the category number is available in a separate table. If the data have not been assigned to any category, the data category number for that data is set to "0". The data category number is freely configurable with Communication Management tool in PCM600. The table below is an example of how the categories can be divided.
| Bit | Description | Data category |
|---|---|---|
| 0 | Data in category 1 changed | 1 = Physical inputs |
| 1 | Data in category 2 changed | 1 = Protection function start/trip |
| 2 | Data in category 3 changed | 1 = LED Alarm |
| 3 | Data in category 4 changed | 1 = New disturbance record available |
| 4 | Data in category 5 changed | 1 = New demand values |
| 5 | Data in category 6 changed | 1 = New peak demand values |
| 6 | Data in category 7 changed | 0 |
| 7 | Data in category 8 changed | 0 |
| 8 | Data in category 9 changed | 0 |
| 9 | Data in category 10 changed | 0 |
| 10 | Data in category 11 changed | 0 |
| 11 | Data in category 12 changed | 0 |
| 12 | Data in category 13 changed | 0 |
| 13 | Data in category 14 changed | 0 |
| 14 | Data in category 15 changed | 0 |
| 15 | Data in category 16 changed | 0 |