Chapter 11 DeviceNet Master Scanner Module AS01DNET-A
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11.4 Master /Slave Mode
11.4.1 Introduction of Master/Slave Mode
AS01DNET-A can work as a DeviceNet master as well as slave with at most 4 AS01DNET modules connectable to the
right side of AS PLC. Running on the right of AS-series PLC, AS01DNET-A with AS-series PLC together constitutes the
DeviceNet master or slave. When working in Master/Slave mode, AS01DNET-A is required to switch the function toggle
(RTU- Master/Slave) to Master/Slave mode and the DeviceNet Builder of version 2.04 and above is used for the setup.
For details about the setup, refer to Section 11.4.10.
As a master, AS01DNET-A can provide the following function.
Supporting the Client function of Explicit message;
Supporting IO polling connection with slaves;
The network configuration software DeviceNet Builder provides graphic configuration interface.
Sending explicit messages to read and write the data in slave through the explicit message instruction
DNETRW.
Automatically performing data exchange with the PLC module; users just need write a program for D register
in the PLC without using FROM/TO instructions.
Offering 190 bytes of output data area and 190 bytes of input data area for exchanging data with the master.
As a slave, AS01DNET-A can provide the following function.
Explicit message Server and Group 2 only server connection mode;
Polling connection;
Offering 200 bytes of input data area and 200 bytes of output data area for exchanging data with master;
Automatically exchanging data with the PLC. The user just need to write a program for D register in the PLC
without using FROM/TO instruction.
11.4.1.1. Scan List, Input Table and Output Table
Item Description Figure
Scan List
Before AS01DNET-A module works, the scan list
must be configured through the configuration
software. The scan list stores slave information
including node address, I/O type, I/O size and etc. for
data exchange. The scanner module manages the
slaves in the scan list, makes a connection with
slaves and exchange I/O data with them. For those
slaves which have not been configured to the scan
list, AS01DNET-A will not make a connection and I/O
data exchange with them.
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