BS1-N018 | NISSEI | POWER MODULE

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Every digital output module houses the circuitry for three identical, isolated channels. Each channel includes an I/O microprocessor which receives its output table from the I/O communication processor on its corresponding main processor. 

All of the digital output modules, except the dual DC modules, use special quadruplicated output circuitry which votes on the individual output signals just before they are applied to the load. 

This voter circuitry is based on parallelseries paths which pass power if the drivers for channels A and B, or channels B and C, or channels A and C command them to close—in other words, 2-out-of-3 drivers voted ON. The quadruplicated voter circuitry provides multiple redundancy for all critical signal paths, guaranteeing safety and maximum availability

NISSEI   BS1-N018

BS1-N018 | NISSEI | POWER MODULE

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Each type of digital output module executes a particular Output Voter Diagnostic (OVD) for every point. Loop-back on the module allows each microprocessor to read the output value for the point to determine whether a latent fault exists within the output circuit

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