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 each 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.
Table 21:
16 bit SSR4 register
Bit
Meaning
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
3.4.7.5
SSR5
The device alive counter SSR5 register is located at address 40132. SSR5 simply
counts upwards from 0 to 65535 and then starts over. The meaning of this register is
to assure that the device is actually operating.
3.4.7.6
SSR6
The last command result SSR6 register is located at address 40133. This client
dependent SSR6 register shows the result of a specific client's last write attempt. This
is especially useful if the exception code 03 appears or if the command initiates a
secured control operation. The client will only see its own results, not the results of
other clients. A client with no write authority will receive a 0x0000 value response
when reading this register.
1MRS757645 B
Section 3
Vendor-specific implementation
620 series
41
Communication Protocol Manual
