The ZRST instruction, also known as the "Interval Reset Command," has an operation code of FNC40. It is used to reset a range of identical components in a PLC system. The instruction takes two operands: [D1·] and [D2·], which define the start and end of the component range. The target operand can be T (Timer), C (Counter), D (Data Register), or Y, M, S (Output Relay, Status Relay, and Auxiliary Relay).
It is important that both [D1·] and [D2·] refer to the same type of component. Additionally, the component number in [D1·] must be less than that in [D2·]. If [D1·] is greater than [D2·], only the component specified by [D1·] will be reset. For example, when M8002 is turned on at the start of the PLC operation, all components from M500 to M599, C235 to C255, and S0 to S127 will be reset automatically. This function is particularly useful for clearing a group of registers or timers efficiently during system initialization.
Steel poles are commonly used to carry several types of electric power lines, distribution lines and lighting system. Distribution lines carry power from local substations to customers. They generally carry voltages from 4.6 to 33kV for distances up to 30 miles, and include transformers to step the voltage down from the primary voltage to the lower secondary voltage used by the customer. A service drop carries this lower voltage to the customer's premises.
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