Iec 104 Polled Object Parameters, And Cpo Setting For Adsus; Figure 25: Example Of Cpo Splitting Adsu Into Read-Only And Read/Write Segments - GE PACSystems RX3i User Manual

Chapter 6. Configuration of IEC 104 Server Parameters Using COMMREQ

6.4.4 IEC 104 Polled Object Parameters, and CPO Setting for ADSUs

The following parameters are optional configurations for RX3i IEC104 outstation configuration. The
optional parameters are application-based, or user-defined, configuration parameters that
determine the outstation functionality and the responses to Client station requests. All configuration
parameter values should be entered in decimal format. Refer to ADSU Supported in General
Interrogation for a description of the mnemonics. Use the parameter descriptions in this section to
determine valid input values for application-based, or user-defined, parameter settings.
Control Point Offset Configuration
The Control Point Offset (CPO) provides a mechanism to separate a given ADSU object into a Read-
Only segment and a Read/Write segment. The CPO configuration should be understood in the
context of the Length and address translation tables.
Each ADSU has CPO and Length parameters. For example, the Length and COP parameters for MSP
ADSU are configured in mComreq_Setup[20] and mComreq_Setup[21] respectively.
The CPO value determines which portion of the ADSU object is Read-Only, and which is Read/Write
as shown below:
a) CPO = 0 All ADSUs are Read-Only.
b) CPO = Length All ADSUs are Read-Only.
c) CPO < Length ADSUs in range [1 to (CPO-1)] are Read-Only;
ADSUs in range [CPO to Length] are Read/Write.
d) CPO > Length All ADSUs in the range [1 to Length] are Read-Only.
Refer to Memory Translation Feature Configuration Parameters, Section 6.3
The example below shows the MSP ADSU object layout for a configured Length = 8 and CPO = 4:

Figure 25: Example of CPO Splitting ADSU into Read-Only and Read/Write Segments

46 PACSystems RX3i Ethernet 104 Server Module User Manual
Non-zero Length
Non-zero Length
Non-zero Length
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