Modular PLCs A flair for flares

PublishTime：2022-08-10

■Ewan McAllister, Technical Director of Elite Control Systems explains, "The original system was configured in such a way that in the event of a failure it simply shut the whole system down... everything. We promptly configured into the system passivation groups. Now if a fault were to develop the group in which the fault lies would only be shut down, giving the highest possible system availability".
■The PLC configuration constructed for BP ensures safety by using two output channels wired in series to hold each safety circuit on. Either output can switch then switch the circuit off. In addition, an input circuit is connected to each of the outputs so that correct operation can be checked by pulsing the outputs for a very short time, which is sufficient to monitor correct response via the fast solid state input circuit, but too fast to trip the shut-down system. For critical inputs, a similar arrangement is used with duplicate inputs arranged so that either can initiate the fail safe response and each is tested by connection to a PLC output that can pulse them for a short time to check for correct operation.

Brand of Product：	MITSUBISHI ELECTRIC
Part#：	Modular PLCs More Part#
Product Category：	More
Application：	More
Data Type：	Application note & Design Guide More
Safety & Environment Standards：	More
Operating Temperature：	Please see the document for details
Qualification Grade：	More
Qualification Approval：	More
Package：
Language：	English Chinese Chinese and English Japanese
Date of Creation：	December 1997
Version Number：
Data Encoding：
Data Size：	54 KB

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