GE Industrial Solutions A Series Lighting Control Panelboards Modbus Register Map - Manual (Page 50)

A Series ® Lighting Controller Modbus Register Map
Load Shedding
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Load Shedding
The Load Shed object defines the Outputs that will be
turned Off, in response to a request for the controller to
reduce its the electrical load. Each output can be assigned
to one of 5 Shed Levels (Table 87) (to define its priority is
relation to the Load Shed request). The lower the priority,
the more likely the output is to be turned Off (0 prevents
the output from being shed). The Load Shed object
properties are read by Function Codes 3/6/16 and written
to using Function Codes 6/16. Table 86 lists Load Shed
Registers.
Load Shed (LS) object – (Registers 30001 – 30069)
Offset Modbus Regs DB size Property Format Range Type
30001 BYTE Value WORD 0 – 3 R
1 30002 WORD Shed Duration WORD 0 – 65535 RW
2 30003 BYTE Shed Level WORD 0 -5 RW
Controlled Object Shed Level
3 30004 BYTE BO1 – Shed Level WORD 0-5 RW
4 30005 BYTE BO1 – Shed Level WORD 0-5 RW
… …
68 30069 BYTE BO66 – Shed Level WORD 0-5 RW
Table 86. Load shed registers.
Type Number Comments
Level 0 0 No Shedding Required
Level 1 1
Level 2 2
Level 3 3
Level 4 4
Level 5 5
Table 87. Shed Level definitions
Sample Packets
Request Response
Field Name Hex Field Name Hex
Device Address 01 Device Address 01
Function 03 Function 03
Register Address Hi 75 Byte Count 06
Register Address Lo 30 Register Value Hi (30001) 00
Registers Hi 00 Register Value Lo (30001) 00
Registers Lo 03 Register Value Hi (30002) 00
Packet CRC Hi Register Value Lo (30002) 05
Packet CRC Lo Register Value Hi (30003) 00
Register Value Lo (30003) 02
Packet CRC Hi
Packet CRC Lo
Table88. Simple packets for read of all LS1 properties.
Table 88 is an example of reading all the LS1 properties:
Value, Shed Duration, and Shed Level.
The response is as follows:
Reg30001 (Value): 0x0000, Inactive,
Reg30002 (Shed Duration): 0x0005, 5 minutes
Reg30003 (Shed Level): 0x0002, Shed Extraneous