
Protection
Modbus
SKF Multilog On
-Line System IMx-M
2 - 187
User Manual
Imported (Write Single) Modbus Registers
An IMx-M protection part Modbus slave has registers that can be written from the
Modbus master.
Notes on Implementation
•
Modbus registers translate according to the table below.
•
The write single function code is 0x06.
•
The read function code is 0x03 (for registers with read/write access).
Table 2-42: Imported (write single) Modbus registers.
Imported (Write Single) Modbus Registers
Register
number
(1)
Access
Function
Definition
257
Write
-only Set disarm slot (same as
register 264)
1 = disarm
0 = arm
258
Read-
Write
(5)
Set disarm analog ch 1 to
16
(2)
MSB = Ch 16, LSB = Ch 1
1 = disarm
0 = arm
259
Read-
Write
(5)
Set trip multiply slot
(6)
1 = enable slot TM
0 = disable slot TM
260
Read-
Write
(5)
Set trip multiply analog ch
1 to 16
(2)
MSB = Ch 16, LSB = Ch 1
1 = TM active
0 = TM not active
261
Read-
Write
(5)
Set latching reset
(4)
1 = reset latching alarms / relays
0 = do nothing
262
Read-
Write
(5)
Set disarm digital ch 1 to
8
(3)
Bit 7 = Ch 8, LSB (Bit 0) = Ch 1
1 = disarm
0 = arm
263
Read-
Write
(5)
Set digital peak (slot)
reset
(4)
1 = reset digital peak
0 = do nothing
264
Read-
Write
(5)
Set disarm slot (same as
register 257)
1 = disarm
0 = arm
(1) Modbus register number 1 is equivalent to Modbus address 0x0000.
(2)
All 16 analog channels are handled in a single write.
(3)
All 8 digital channels are handled in a single write.
(4)
This value is NOT written permanently in the register. One write = one
reset.
(5)
A read of a register will get the previous written value by Modbus. It will not reflect the current system status or
whether the command was executed or not.
(6)
Slot TM will activate/deactivate channel TM status
MSB = Most significant bits
LSB = Least significant bits