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AS-i/Modbus Gateway Address-Table of the Modbus Interfaces
Subject to reasonable modifications due to technical advances Copyright Bihl+Wiedemann, Printed in Germany
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8 Address-Table of the Modbus Interfaces
8.1 Discrete Outputs (“ Coils ”)
The discrete outputs of a Modbus slave can be read by function 1 and manipulated
by function 5 and 15.
In the case of AS-i/Modbus gateway it is possible to access the output-data (actuator-
data) of the AS-i circuit, the
LPS (List of projected-slaves) and the host interface flags .
Additionally all data, that is addressable as “Coil ” , could also be accessed as “Holding
Register” (see chapter 8.3).
To achieve a short response time, it is advisable to use the Modbus functions 1 and
15 only with both start addresses and quantity of outputs divisible by eight. In all other
cases the master must costly sort in every bit to transmit.
Data_Exchange_Active : If this output is set, no data-transmission between the AS-i/
Modbus gateway and the AS-i-slaves is possible.
Off-line : This output sets the master to off-line phase.
Auto_Address_Enable : This output blocks automatic slave-address programming.
Output Data Image ODI
Address Data element
0
1
2
3
4
5
...
122
123
124
125
126
127
slave 0, connector D0
slave 0, connector D1
slave 0, connector D2
slave 0, connector D3
slave 1, connector D0
slave 1, connector D1
...
slave 30, connector D2
slave 30, connector D3
slave 31, connector D0
slave 31, connector D1
slave 31, connector D2
slave 31, connector D3
Host-Interface Flags
Address Data element
128
129
130 “ Data_Exchange_Active ” (inverted!)
“Off-line”
“
Auto_Address_Enable ” (inverted!)