4P642495-1A
–
2022.02
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3. Modbus registers
Input registers
30001 till 30009
General
Modbus Interface DIII
status (incl. Detected DIII units & communication
status of DIII units)
31001 and higher
Individual DIII units information
Holding registers
41001
Modbus Interface DIII
central “forced off”
42001 and higher
Individual DIII units instructions
Calculation method for input & holding registers of each connected DIII group address:
DIII group address has an “upper address” and a “lower address”.
Example for 1-
00: “1” is the upper address, “00” is the lower address.
Register of a DIII group address: Base r((
upper address
-1)*16+
lower address
)*step
E.g. capability input register for 4-
15: 31001+((“4”
-
1)*16+”15” )*3 = 31190
3.1. Input registers
Input
register
Bit
Description
Meaning
30001
15..2
-
1
Other DIII
device exists
0: No
1: Yes
Note: When another DIII device is connected
or disconnected to the DIII, it can take up till
10 minutes to update the status of the input
register.
(Remark: Initially delivered from factory the
value is 1)
0
Modbus
Interface DIII
status
0: Busy
1: ready
Typical at power on of the option, the DIII
communication is started with the connected
DIII units. At the end of the communication
start up, all the input registers and holding
resisters have the correct initial values.
30002
15..0
DIII unit
connected
status
0: not
connected
1: connected
DIII address 1-00 (bit 0) till 1-15 (bit 15)
30003
15..0
DIII address 2-00 (bit 0) till 2-15 (bit 15)
30004
15..0
DIII address 3-00 (bit 0) till 3-15 (bit 15)
30005
15..0
DIII address 4-00 (bit 0) till 4-15 (bit 15)
30006
15..0
DIII unit
communication
status
0: Normal
1: Com-
munication
error
DIII address 1-00 (bit 0) till 1-15 (bit 15)
Typically when a DIII device is connected
once, and then disconnected: it can take up
till 10 minutes to discover the communication
error.
30007
15..0
DIII address 2-00 (bit 0) till 2-15 (bit 15)
30008
15..0
DIII address 3-00 (bit 0) till 3-15 (bit 15)
30009
15..0
DIII address 4-00 (bit 0) till 4-15 (bit 15)
