Does the Yokogawa CS3000 issue a PERR alarm when switching using SIO-21?
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The Yokogawa CS3000 uses SIO-21 to configure single-control dual-feedback switch valves. When these valves are switched, a PERR alarm is generated. According to available information, this occurs because both the open and closed feedback signals are at the ON state simultaneously. In our system, both the open and closed feedback signals are connected to normally open contacts; therefore, during the switching process, before the valve has reached its final position, both the open and closed feedback signals are definitely in the OFF state. Should one of the feedback signals be connected to a normally open contact and the other to a normally closed contact?
Based on the situation you described, if both the return signal and the output signal are set to ON or OFF, it will trigger a PERR alarm; this is likely due to an issue with the wiring method when using the SIO-21 configuration for controlling a two-way switch valve with single control in the Yokogawa CS3000. Under normal conditions, the on and off feedback should be connected to the normally open contacts and normally closed contacts respectively, to ensure that the feedback status is correct during switching. It is recommended that you carefully check the wiring to ensure that the open feedback and closed feedback are connected to the correct contacts respectively. If the problem persists, it may be necessary to consult the operation manual of the relevant device or contact the manufacturer’s technical support for further investigation and resolution. .
This post was last edited by jlshnlhj on 2023-8-17 08:06. The Answerback Check Suppression Timer setting is incorrect. The instructions for SIO-21 are on pages D3-172 to D3-191 of the CS 3000 Reference Function Block Details; pay special attention to page D3-180 regarding the settings for the Answerback Check Suppression Timer.
PERR should be an alarm that indicates both on and off feedback; if neither of these is present, it is not this alarm
The detection time can be adjusted, so that no alarm will be triggered