Burkert Type 8741 - Manual (Page 28)

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Operationandfunction
Type 8741
9.6.2 in the büs network, other peers
process the process values.
The MFM/MFC can receive and process the process values from other
büS peers in a büS network.
For example, another bus peer can provide the MFC with a setpoint or
the MFC/MFM can send its process values to other büS peers. In this
way, the current measured value can be received by a different device.
"Bürkert Communicator" software is required to configure this function
(see Section 10.3.1 PC Software). The procedure is described in the
supplementary operating instructions "Digital Communication, Type
8741".
9.6.3 specifying the SETPOINT SOURCE
The MFC can specify controlling setpoints from various sources.
It is possible to switch between
SETPOINT SOURCES during
operation.
The change of
SETPOINT SOURCE occurs via
• a setting in the "Bürkert Communicator" software (see section
"12.3 Bürkert Communicator (PC software)") or
• by changing an EDS object of the device.
The SETPOINT SOURCE setting is normally retained after
a restart. However, this is not the case if the device per-
forms a
SYSTEM ANALYSIS function.
The procedure for specifying the SETPOINT SOURCE is
described in the supplementary operating instructions "Digital
Communication, Type 8741".
aUtomatic function:
If the AUTOMATIC setpoint source is selected, a standard setpoint is
used which is specified via the CANopen or büS fieldbus. This standard
setpoint can be manipulated by other fieldbus peers.
If different fieldbus peers simultaneously specify a setpoint for the
device, it is always the most recent value that is used for control.
MANUAL SETPOINT function:
The manual specification of a setpoint is used independently of the
standard setpoint used in AUTOMATIC operating mode.
This ensures that the setpoint value for testing purposes or the modi-
fication by a display cannot we overwritten from other fieldbus peers.
STORED SETPOINT function:
A fixed setpoint can be applied using this function. This fixed setpoint,
which is used for regulation, remains even when the device is restarted.
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