1502-VC4DBDA-0 A-B  Analog Input Module

These instructions, when used in ladder programs represent hardwired logic circuits used for the control of a machine or equipment. The basic instructions are separated into three groups: bit, timer, and counter. Before you learn about the instructions in each of these groups, we suggest that you read the overview that precedes the group: • Bit Instructions Overview • Timer Instructions Overview • Counter Instructions OverviewBit instructions are used with the following data files: • Output and input data files. These represent external outputs and inputs. • The status data file (file 2). • The bit data file (B3:). These are the internal coils used in your program. • Timer, counter, and control data files (T4:, C5:, and R6:). These instructions use various control bits. • The integer data file (N7:). Use these addresses (at the bit level) as your program requires.

When you assign an address to the OTL instruction that corresponds to the address of a physical output, the output device wired to this screw terminal is energized when the bit is set (turned on or enabled). When rung conditions become false (after being true), the bit remains set and the corresponding output device remains energized. When enabled, the latch instruction tells the controller to turn on the addressed bit. Thereafter, the bit remains on, regardless of the rung condition, until the bit is turned off (typically by a OTU instruction in another rung).

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