Safety Do Card; Safety Do Function - Flowserve Logix 520MD Plus Series User Instructions

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
Safety DO
3.6
Specifications
Electronic
7.9
Connections
DO Status Table 12: Auxiliary Card Status
Safety
Discrete
Output
Card
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.
© Flowserve Corporation
User Instructions - Logix® 520MD+ Series Digital Positioner
IOM Section
Safety Discrete Output
Safety Discrete Output (Safety DO
)
36
Field Trial Version – Printed October 28, 2011
FCD LGENIM0105-00