| Most PLCs typically run their own software
for data acquisition and monitoring tasks. A few PLCs typically
require extra software to manage communications between the PLC and
the Citect network. This software must be downloaded into the PLC
using the PLC programming software before Citect can establish
communications with the device. This communications software is
called a Comms Function Block, and an example of its use is with
the Siemens SINECFDL driver.
In cases where a Comms Function Block is required, the function
block will be distributed with Citect in situations where CiT have
negotiated permission for this with the PLC manufacturer. The Comms
Function Blocks are normally kept in the citect\bin subdirectory.
For further information on downloading the function block, refer to
the programming software provided with the PLC. |
