ABB CSU-2LV, Installation And Maintenance Manual, Page: 65 / 84

ABB
ARC GUARD SYSTEM™ – CSU-2LV/2MV INSTALLATION AND MAINTENANCE GUIDE 65
6.7.3 Practice via PLC
This section shows a demo about how to read system
status using a Programmable logic controller (PLC). We use
AC500 and Automation Builder as a development platform.
We choose the same Modbus ID, baud rate and frame
format as previous practice. These settings can be
configured in Modbus parameters in Automation Builder.
A build-in function block from AC500, “COM_MOD_MAST”,
is used for sending/receiving Modbus telegrams via COM
interface. Do the following steps to set up a program
with Ladder:
• CSU2_COM: COM_MOD_MAST;
• enable: BOOL;
• READ_VALUE: ARRAY [1..15] OF UINT;
• FCT_READ_HOLDING_REGISTERS:BYTE:=3;
• NUM_VARIALBE_READ: UINT := 1;
• REGISTER_ADDRESS:BYTE:=100;
• TIMEOUT_TIME: WORD := 1000;
• SLAVE_ID: BYTE := 5;
We set up the network as following:
Results are shown in READ_VALUE array.
Figure 36
PLC network
1SFC170020M0201
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