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LS 4 remote control data table 4:0001
The LS 4 remote control data table is located in the so called Holding Register address
block, which sometimes is also identified with offset 4:0000. The block can be written
to using Modbus function code 16 Write multiple registers or function code 06 Write
single register.
If Remote Control is enabled, the three remote control words are sent cyclically to the
respective LS 4. They are also stored in the GCP-MG's memory and can be read back using
Modbus function code 03 Read holding registers.
Remote control is disabled by default and Modbus exception code 03 Illegal value
is returned if a Modbus master tries to access remote control functions for a unit
configured as read-only
Remote control can be enabled on a per unit basis through the LS 4 settings page of the
GCP-MG (see the section called "Configuring GCP-30 and LS 4 Modbus access").
Block
Modbus
address
4
0001
4
0002
4
0003
Table 6.10: Modbus addresses for LS 4 remote control
If no response was obtained from the target LS 4 unit, Modbus exception code 0B
Gateway target device failed to respond is returned.
42
LS 4 word
LS 4 manual designator
no.
501
(not used for LS 4)
502
(not used for LS 4)
503
Control word
Encoding
Bit 1: 1 = Open CB (high priority)
Bit 2: 1 = Close CB
Bit 3: write always 0
Bit 4: write always 0
Bit 5: 1 = Alarm Acknowledgment
Bit 6-16: internal use
UMGCPMG-2201
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