A fault condition that caused a shutdown.Typically, data in the shift register could represent the following: When this happens, the first data bits fed into the shift register by the shift pulse are lost at the end of the shift register. At some point, the number of data bits fed into the shift register will exceed the register’s storage capacity. A shift pulse or clock causes each bit in the shift register to move 1 position to the right. Controlling of machine or process operationsįigure 1 illustrates the basic concept of a shift register.Tracking of parts through an assembly line.Common applications for shift registers include the following: Shift registers can shift either status or values through data files. We use the shift register whenever we need to store the status of an event so that we can act on it at a later time.
The bit shift register shifts bits serially (from bit to bit) through an array in an orderly fashion.Ī shift register can be used to simulate the movement, or track the flow, of parts and information. A bit shift register is a register that allows the shifting of bits through a single register or group of registers. The PLC not only uses a fixed pattern of register (word) bits, but also can easily manipulate and change individual bits. PLC Shift Register Instructions & Programs Shift registers are often used to track parts on automated manufacturing lines by shifting either status or values through data files. This article explains how the PLC shift register functions operate and how it can be applied to control problems.
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