User-Definable Data - ABB Relion 620 Series Protocol Manual

Section 3
Vendor-specific implementation
3.4.8
42
Table 22: 16 bit SSR6 register
ClientCmdSEQNo Cmd State Resp Type
15 14 13 12 11
ClientCmdSEQNo
Counts the client's control operations from 0000...1111, that is 0...15, and then starts
over.
CmdState
00 = No write command has ever been issued by this client
01 = Command in progress
11 = Response Ready
RespType
01 = Unsecured control response
10 = Secured control response
11 = Modbus 03 exception response valid. CMDResultCode is in this case 0. The
reason for the 03 exception is an invalid written value.
Table 23: CMDResultCode
Code Meaning
0 OK
201 Device in local mode
202 Control operation reserved by another client
203 Select-timeout or Execute/Cancel without select
204 Control operation internally blocked
205 Control operation timed out
250 Other reason

User-definable data

There can be several reasons for defining UD data. For example, the user may want to
repack a limited amount of important data into sequential addresses and thereafter
only scan this smaller set of data. Especially with serial links, this saves bandwidth and
improves response times.
User-definable register can be used if more advanced rescaling and re-manipulating
of the regular Modbus register is needed. Many of these features are defined for
10 9 8 7 6
1MRS757645 B
CMDResultCode
5 4 3 2 1
620 series
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