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9.10.2
Allocation: virtual IOs / real IOs
A distinction is made between virtual IOs and actual IOs.
•
Actual IOs are physical inputs, physical outputs and timer functions on the MODBUS master, on
add-on modules and on devices connected via the MODBUS interface.
•
Virtual IOs are the inputs and outputs used to make the settings on the MODBUS master.
The actual inputs and outputs that the virtual inputs and outputs affect can be freely assigned. This
enables the
“
pool
”
of available actual IOs (signal sources) to be used as effectively as possible.
The possible selection of signal sources that can be assigned to the virtual IOs depends on the
available actual IOs.
Example of possible assignments from actual to virtual IOs
Pool reale IOs
Signal sources
Virtual IOs
Possible assignments
IO parameters
Setting
MODBUS Master
Analog outputs: A1, A2
Analog inputs E1, E2
Digital outputs: K1, K2
Digital inputs: D1, D2
Timer1
Add-on module type Z-
Modul-B02
Analogue outpu:t A3
Analog inputs E3, E4
MODBUS Interface
Holding register
Input register
AO1 - AO6
Assign analog outputs from:
Settings for analog outputs:
Function
minimal output voltage
maximal output voltage
Inverting Output voltage
MODBUS Master (A1, A2)
Add-on3module type Z-Modul-B02
(A3)
AI1 - AI6
Assign analog inputs from:
Settings for analog inputs:
Function
Signal type setting
Inverting input
MODBUS Master (E1, E2)
Add-on module type Z-Modul-B02
(E3, E4)
MODBUS (MB.h 9000, MB.h 9001)
DO1 - DO8
Assign digital outputs from:
Settings for digital outputs:
Function
Inverting Relays
MODBUS Master (K1, K2)
DI1 - DI8
Assign digital inputs from:
Settings for digital inputs:
Function
Inverting input
MODBUS Master (D1, D2,
D1andD2, D1orD2)
MODBUS Master (Timer1)
Add-on module type Z-Modul-B02
(E3, E4) *
MODBUS (MB.c0, MB.c1)
*
When assigning the analog inputs of the auxiliary module, they are used as digital inputs
Operating Instructions
UNIcon MODBUS Master
Programming
L-BAL-E255-GB 1901 Index 001
Part.-No.
64/121