Pinnacle Systems DR - Manual (Page 10)

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Introduction
problems from occurring simultaneously in both
redundant circuits.
• Force-guided relays allows dry relay contacts to
be monitored for contact welding and/or circuit
failure.
• Watchdog timers on both computers and both
safety relays assures that a system lock-up will
automatically drop out the safety relays.
• Through the use of shielded cables, chokes,
surge suppressers, and optically-coupled inputs,
immunity to EMI/RFI fi elds is greatly increased.
• The MicroGuard DIN-rail was designed to meet
the European IEC 61496 standard parts 1 and 2
(part 2 requires use of optional 2 degree pylons),
CSA, UL 1998, UL491, UL991, OSHA, ANSI, and
RIA.
• Surface mount technology is used throughout for
increased reliability.
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