14
8903/IM 8903/IP Ethernet Communications Interfaces
Step 2: Configuring the PLC/SCADA Supervisor
This section contains examples for configuring a Modicon PLC, an Allen-Bradley PLC and the
TS8000 Operator Interface. The Ethernet Technology Box supports the ModBus/TCP protocol
and the Ethernet/IP protocol.
Modicon Momentum
1.
Start a new program and select
the PLC processor and chassis
type used in your project. Our
example uses an M1 980-20
Momentum PLC. Stay offline
until you are ready to
download the program.
2.
Place an MSTR block in the
ladder logic. MSTR blocks
move data from the PLC data
table to the drive or from the
drive to the PLC data table.
Two MSTR blocks are
necessary for a Read and Write
operation.
3.
Right click over the MSTR
block. This will access the
Register Editor. Use the
Register Editor to configure
the block. The MSTR block
has two types of operations:
Read or Write. The first
register defines the type of
operation. In our case address
40100 is used for write
command and address 40200 is
used for read command. A
value of 1 in the data column
defines a Write operation. A
value of 2 in the data column
defines a Read operation.
Figure 14. PLC Ladder Logic
showing MSTR Blocks
Figure 15. Read Registers
