CET PMC-592, User Manual, Page: 115 / 177

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CET Electric Technology
Chapter 5 Modbus Register Map
This chapter provides a complete description of the Modbus register map ( Protocol Version 1.7 ) for the
PMC-592 to facilitate the development of 3
rd
party Modbus RTU communications driver for accessing
information on the PMC-592.
The PMC-592 supports the following Modbus functions:
1) Read Holding Registers (Function Code 0x03)
2) Force Single Coil (Function Code 0x05)
3) Preset Multiple Registers (Function Code 0x10)
4) Read Energy Files (Function Code 0x14)
The following table provides a description of the different data formats used for the Modbus registers:
Format Description
UINT16/INT16 Unsigned/Signed 16-bit Integer
UINT32/INT32 Unsigned/Signed 32-bit Integer
Float
IEEE 754 32-bit
Single Precision Floating Point Number
For a complete Modbus Protocol Specification, please visit http:// www.modbus.org .
5.1 Status Register
5.1.1 General Status
Register Property Description Format Note
0000 RO DI Status 1 Bitmap
0001 RO DO Status 2 Bitmap
0002 RO Latest Alarm Channel Bitmap See Appendix A
0003 RO Diagnostics
3
Bitmap
0005 RO Run Time UINT32
0007 RO SOE Pointer 4 UINT32
0009 RO IER Log Pointer
5
UINT32
0011 RO WFR Log Pointer
6
UINT32
0013 RO WFR Status UINT16
0 = WFR Disabled
1 = WFR
Table 5-1 General Status
Notes:
1) For the DI Status register, the bit values of Bit 0 to Bit 3 represent the states of DI1 to DI4, respectively, with “1” meaning
Active (Closed) and “0” meaning Inactive (Open). If the PMC-592 is not equipped with the optional DI3 and DI4, their values
have no meaning and their bits are reserved. The remaining bits are reserved.
2) For the DO Status register, the bit values of Bit 0 to Bit 1 represent the states of DO1 to DO2, respectively, with “1” meaning
Active (Closed) and “0” meaning Inactive (Open). The remaining bits are reserved.
3) The Diagnostics register indicates the various system statuses with a bit value of 0 meaning normal and 1 meaning fault. The
following table illustrates the details of the Diagnostics register.
Bit Alarm Event Bit Alarm Event
Bit 0 NVRAM Fault Bit 10 Breaker Parameters Incorrect
Bit 1 Disk Fault Bit 11 Alarm Parameters Incorrect
Bit 2 A/D Chips Fault Bit 12 Branch Parameters Incorrect
Bit 3 CT Strip not inserted Bit 13 VM Parameters Incorrect
Bit 4 Internal Power Supply Fault Bit 14 Calibration Parameters Error
Bit 5 Clock battery voltage is low Bit 15 Internal Parameters Error
Bit 6 DSP Fault Bit 16 External DI Module Fault*
Bit 7 System Parameters Error Bit 17 DR Parameters Incorrect~
Bit 8 SM Name Parameters Incorrect Bits 18 -31 Reserved
Bit 9 Communication Parameters Incorrect
* Available in Firmware V1.00.03 or later
~ Available in Firmware V1.00.04 or later
Table 5-2 Diagnostics Register (Reg. # 0003)