You can create a mode point for each physical redundant PLC. The point contains the following information:
|
Description |
Bit |
Value |
|
Device health |
1 |
1 = device OK |
|
Current master CPU Status |
2 3 |
1 = current master 1 = CPU is running |
The first and second bits contain the mode information from the programmable controller. The mode address is defined in the Mode Address field on the TCP/IP tab in the Port Properties dialog box when you create the port.
The third bit indicates the status of the CPU. The CPU is considered to be not in run mode if its state is any of the following:
STOP_IO_DISABLED
CPU_STOP_FAULTED
CPU_HALTED
CPU_SUSPENDED
STOP_IO_ENABLED
The addresses for the Mode diagnostic points are:
|
$MODE_P1 Mode Point |
Primary PLC |
|
$MODE_P2 Mode Point |
Secondary PLC |
|
$MODE_P3 Mode Point |
Third PLC |
|
|
Series 90 TCP/IP Triplex diagnostic points. |
