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搜尋常見問題

Why Vijeo Citect shows #BAD variables while communicating to OTB1E0DM9LP over modnet Protocol?

Vijeo Citect modbus driver has a default mechanism of block read by default.  Whereas OTB modules modbus address range for inputs is 0-99
and for output is 100-199 . Also OTB allocates modbus registers only when cards are used else they will remain reserved.  Due to this behavior
of module when citect performs a default block read, communication fails with variables showing #BAD on graphics page.

To overcome this issue add "G" as a prefix to modbus addresses to force citect perform single read requests rather than block read.
For example using modbus address as G40100,  G40101 etc for variables in vijeo citect.

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