Applies To:
  • CitectSCADA 5.xx
Summary:
I have some Momentum I/O that supports Ethernet and the MODBUS/TCP specification (see KB article Q2605).  I want to use Citect with it - can I use the Citect MODNET driver? 

Solution:
No, the Momentum Ethernet option is not supported by Citect.  Whilst the protocol that the device uses is supported by Citect's MODNET driver, the device's operating characteristics are different to a standard PLC.  Therefore, the MODNET driver is unsuitable for use with the Momentum I/O.

There are no current plans to support the Momentum I/O directly in Citect.  Users should interface the Momentum I/O to an appropriate controller, and then communicate to that controller with Citect.

Footnote: The "operating characteristics" referred to include:

- the failsafe mode on outputs, such that the driver must continually write to the outputs within a certain time period.  The driver does not do this, as it polls on demand.

- multiplexing of inputs & outputs are also not supported.

 
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