Logix
®
520MD+ and 510+ Digital Positioners FCD LGENIM0105-15-AQ – 05/16
52
13 MULTI-FUNCTION CARD
The optional Multi-Function Card (MFC) can be configured to act as
an Analog Output, Discrete Output, or Discrete Input. Up to two MFCs
may be installed at one time.
NOTE:
With Logix 510+, only Card 1 is available with either AO
or limited DO function.
MFCs are immune to RFI/EMI disturbances. See certifications in
section 3.
Table 22: Multi-Function Card Cross-References
Information
IOM Section
Pg
Analog Output Specifications 2.4 Analog Output
10
Electronic Connections
7.3 Multi-Function Card (AO, DO, DI) 29
Status
Table 14: Auxiliary Card Status
30
Configuration
10.3.14 Card 1 (or Card 2)
48
Certifications
3 Hazardous Area Certifications
13
Figure 42: Multi-Function Card
13.1 Analog Output (AO)
Configure the MFC as an Analog Output device to produce a 4-20 mA
signal that corresponds to the position of the valve.
Output follows actual position of valve, including all failure modes of
positioner except loss of power. An output of < 1.0 mA is transmitted
when the positioner loses power.
Calibration of the analog output signal is performed using the display
menu, a HART handheld communicator, or the ValveSight DTM or
push-buttons. To change the Multi-Function Card to the Analog Out-
put function and calibrate using the buttons, see section 9.7.
The MFC configured as an AO does not interfere with positioner
operation.
NOTE:
The AO signal corresponds with the Signal At Closed
configuration switch setting. If the valve closes with a 4 mA
signal, the AO will show a 4 mA signal when closed. If the valve
closes with a 20 mA signal, the AO will show a 20 mA signal
when closed.
13.2 Discrete Output (DO)
Use the Discrete Output function of the MFC to indicate a variety of
conditions such as alarms, warnings, position limits, etc. Alarms that
are masked will not cause the DO to trip. The current is normally high,
and drops low when one of the pre-configured states occurs.
Configuration of the discrete output signal is done using the ValveS-
ight DTM or push-buttons. To change the Multi-Function Card to the
Discrete Output function using the buttons, see section 9.7.
With Logix 510+, the DO function may be selected using push but-
tons, but will be limited to trip on the deviation alarm only.
The MFC configured as a DO does not interfere with positioner oper-
ation.
The MFC DO complies with DIN 19234 standard. For specific current
limits, see Table 14: Auxiliary Card Status.
13.3 Discrete Input (DI)
Use the Discrete Input function of the MFC to signal the positioner to
begin a partial stroke test, or move to a predefined position as long as
the signal remains.
Supply a low voltage (or no voltage) to indicate a normal state. Raise
the voltage to indicate the tripped state.
Configuration of the discrete output signal is done using the display
menu, a HART handheld Communicator, or the ValveSight DTM .
For specific voltage limits, see Table 14: Auxiliary Card Status.
NOTE:
When 2 cards are configured as DI at the same time,
where both are configured to override the position command, the
card in slot 1 will take priority regardless of the order in which
the override commands are triggered.
a
CAUTION:
During the use of the Discrete Input function, the valve
may stroke unexpectedly. Follow internal procedures, ensuring
that the configured movement of the valve (performing a PST or
moving to a set-point) is allowed. Notify proper personnel that
the valve will stroke, and make sure the valve is properly isolated
if required.
Multifunction Card
