1747-M1 A-B programmable controller module
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Also called “All–or–Nothing Relays with Positively Driven Contacts”. Relays of this type have contacts that are mechanically connected together, such that if a normally open (NO) or make contact remains closed, a normally closed (NC) or break contact can not re–close. Additionally, if a NC contact fails to open upon energizing the relay, the NO contacts shall not close. This is outlined in ANSI B11.19 and EN 50205.
The positive–guided feature is necessary in the circuit design to ensure that the circuit does not re–close after a fault. Redundant contacts wired in a series ensure that the power can be removed from the load, even if a contact has welded. Refer to the redundant, self–monitoring circuit (page 5) for a more extended explanation. Relays with positive–guided contacts can be the standard panel or DIN rail mount varieties, or printed circuit board mount, like those found inside safety relays.
The figure below shows a typical control circuit with a master control relay. This circuit works fine, if we can assume that CR(b) never welds. If CR(b) were to weld, pushing the E–Stop button will not remove power from the motor (M). If the motor drives a blade or cutter, the hazard can not be disabled. If the operator assumes the blade has stopped and enters the area, he could suffer serious injuries
If a process can cause serious harm to an operator, it is a likely candidate for a redundant, self–monitoring control circuit, like the one shown below. This is similar to the internal circuit found in an Allen–Bradley safety relay. It is redundant because it uses three relays (redundancy requires two or more of a given component). It is self–monitoring or self–checking because it allows power to be removed from a load, even if a contact welds, but will not allow a subsequent restart until the fault is eliminated.
The structure and details of the product：
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