Abstract
This chapter describes the master control instruction. The master control instruction enables a group of instructions to be controlled by a single master contact, which effectively switches power to those instructions. The MCR instruction is used at the end of the set of instructions and any instructions following the MCR instruction are not under the control of the master contact. It explains the concept of nesting level. The nesting level number refers to the number of a master control circuit, which is linked within other master control circuits. It discusses the principle of operation of various lines, such as 0-4, 10, 16-24.
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