Instruction Manual
www.Fisher.com
SIS Locked In Safety Position Behavior During
Power Interruption
Supplement to Fisherr FIELDVUE™ DVC6200 SIS Digital
Valve Controller Instruction Manual
This supplement applies only to DVC6200 SIS Deenergize to Trip (DETT), PointtoPoint (420 mA) operation.
WARNING
This instruction manual supplement is not intended to be used as a stand-alone document. It must be used in conjunction
with the following documents:
Safety manual for DVC6200 SIS Digital Valve Controller (D103601X012)
Fisher FIELDVUE DVC6200 SIS Instruction Manual (D103557X012)
Failure to use this instruction manual supplement in conjunction with the above referenced manuals could result in
personal injury or property damage. If you have any questions regarding these instructions or need assistance in obtaining
either of these documents, contact your Emerson Process Management sales office.
Introduction
The DVC6200 SIS digital valve controller has ridethrough capability which allows it to withstand short interruptions in
loop current during a logic solver card redundant switchover or proof test.
This is part of the DVC6200 SIS digital valve controller design and requires no configuration.
Description of SIS Locked In Safety Position
SIS Locked in Safety Position is an alert used to describe when the device is in its safety position and ready for
manual reset.
If a power interruption occurs when the DVC Power Up parameter is set for Manual Reset, it will result in the device
tripping and latching in the safety position, even after power is restored. The SIS Locked in Safety Position alert will
appear. To resume normal operation, the device may be manually reset by shorting the AUX terminals or depressing
the green button on the LCP100.
A power interruption can consist of any of the following:
a.) loop current less than 3.5 mA for greater than 40 ms
b.) loop current between 4 and 12 mA for greater than 325 ms
c.) loop current between 4 and 16 mA for greater than 325 ms if a loop powered LCP100 is also present
Instruction Manual Supplement
D103801X012
DVC6200 SIS
January 2014