PLC Ch. 9 Study Exam Questions Correctly Answered.

PLC Ch. 9 Study Exam Questions Correctly Answered. Master control reset (MCR) and jump (JMP) are often referred to as override instructions. - CORRECT ANSWER true The MCR instruction can only be programmed to control an entire circuit. - CORRECT ANSWER false When the MCR instruction is true, all rung outputs below the MCR will be controlled by their respective input conditions. - CORRECT ANSWER true If the MCR output is turned off or de-energized, all nonretentive rungs below the MCR will be de-energized. - CORRECT ANSWER true Retentive instructions should not normally be placed within an MCR zone because they will remain in their last active state when the MCR instruction goes false. - CORRECT ANSWER true When programming an MCR instruction to control a fenced zone, an MCR rung with no conditional inputs is placed at the beginning of the zone and an MCR rung with conditional inputs is placed at the end of the zone. - CORRECT ANSWER false The master control instruction is used as a substitute for a hardwired emergency stop switch. - CORRECT ANSWER false The JMP instruction is used to jump over certain program instructions if certain conditions exist. - CORRECT ANSWER true The advantage of the JMP instruction is the ability to reduce the processor scan time.. - CORRECT ANSWER true