Configuration Manual Owner manual

Publication 1757-PM002A-EN-E - June 2006
3-2 Basic Function Blocks
Transducer Block
The Transducer Block acts as the connection between the physical world of
wires and circuit boards to the electronic world of RSFieldbus. The XDCR
allows the I/O blocks to access data on the wire and bring it into RSFieldbus
to be used for control loops.
The important parameters within the XDCR are MODE_BLK and
TERMINAL_NUMBER. Putting the MODE_BLK to AUTO allows the
function block to be active upon download.
TERMINAL_NUMBER reflects the physical wiring on a transmitter. Some
transmitters have multiple inputs or outputs, so the parameter links the
function block to the actual physical wires that have been landed on that
terminal.
Input/Output Blocks
The I/O Blocks take the data retrieved from the transducer links and makes it
available to RSFieldbus for use.
The important parameters within the I/O blocks are the MODE_BLK and
CHANNEL. Putting the MODE_BLK to AUTO allows the function block
to be active upon download.
CHANNEL is the I/O block equivalent of the XDCR’s
TERMINAL_NUMBER. When the CHANNEL parameter is equal to the
TERMINAL_NUMBER, data will flow from the physical transmitter wires to
the I/O blocks and from the I/O blocks to the transmitter wires, eventually
then to the device.
There are several things to keep in mind with regards to function block use.
The sheer volume of individual transmitters available makes listing them all
virtually impossible. The function blocks discussed here will allow a user to put
a device on the wire, access it through RSFieldbus, and retrieve data. The
actual use of these and all functions blocks are based on the individual vendor.
For answers to more specific questions, refer to your vendor’s manual in
regards to how best to use these and any other functions blocks.
Put Blocks in Auto
There are a few blocks that need some additional work in order to get them to
go into Auto. The Analog Output, Digital Output, APID, Splitter, and
Setpoint Generator all have an IMAN status in the MODE_BLK parameter.
This status is in response to the parameter BKCAL_ (OUT/IN) being used. It
has to do with the handshaking between two blocks that need to be connected
before the IMAN can be cleared.