User Instructions - Logix® 520MD+ Series Digital Positioner
FCD LGENIM0105-00
© Flowserve Corporation 19 Field Trial Version – Printed October 28, 2011
7.9 Safety Discrete Output (Safety DO)
The Safety Discrete Output (Safety DO) provides a relay-
style, open or closed circuit. Connections to the Multi-
Function Card are made directly to the card terminals.
Wire the Safety DO in series with a power supply, including a
method to determine the current or voltage. The circuit will
remain closed until specific conditions are met, then the
circuit will open. For detailed information about voltage and
current limits, see Table 12: Auxiliary Card Status above.
Figure 13: Safety Discrete Output Circuit
7.10 Limit Switches
Limit switches provide an independent verification of the
position of the feedback shaft. Wire the limit switches
according to the following table. For more information, see
table Table 10: Limit Switch Specifications on page 8.
Table 13: Limit Switch Connections
Terminal (See Figure 14)
Switch
1 2 3 4 5 6
Mechanical
Cherry DG 13-B2RA
2 & 5 NC
+ + - + + -
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