User Instructions - Logix® 520MD+ Series Digital Positioner
FCD LGENIM0105-00
© Flowserve Corporation 36 Field Trial Version – Printed October 28, 2011
15 SAFETY DO CARD
15.1 Safety DO Function
The optional Safety Discrete Output Card (Safety DO)
provides a way for the user to detect errors that are critical
to the ability of the system to move to a safe state should
there be a failure of power or supply gas to the positioner.
One Safety DO may be installed at one time.
Table 20: Safety DO Card Cross-References
Information IOM Section
Safety DO
Specifications
3.6 Safety Discrete Output
Electronic
Connections
7.9 Safety Discrete Output (Safety DO
)
DO Status Table 12: Auxiliary Card Status
Figure 22: Safety Discrete Output Card
The Safety DO card uses a relay-type circuit which can be
closed or open. Normally, the circuit is closed. An open
circuit indicates the positioner has detected one of the
following errors:
• Position Deviation Alarm
• Pilot Relay Response Alarm
• Driver Module Alarm
The Safety DO requires no positioner configuration.
The Safety DO is immune to RFI/EMI disturbances.
The Safety DO does not interfere with positioner operation.
The Safety DO adds 3 VDC to the terminal voltage.
Safety
Discrete
Output
Card
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