PLC Counter Instructions

The Count Up instruction increases the instruction tag's __________ value by one each time the rung containing the counter goes from false to true.

Accumulated (or ACC)

The FRD instruction is an internal output instruction that converts BCD data, such as an input tag, into a __________.

Decimal equivalent

Each decimal digit of an LED display is controlled by___________ data lines that are wired to four output terminals of a PLC output module.

Four

The BCD system uses ___________ bits to represent each decimal digit.

Four

A __________ is an output device that enables a machine operator to view the accumulated or preset value of an instruction with out the use of a programming terminal.

LED display

The __________ instruction zeroes a counter tag's accumulated value and clears all of its status bits.

Reset

A BCD thumbwheel switch consists of one or more _________ that each control four data lines.

Rotary switches

The _______________ instruction converts a decimal data tag, such as the Preset value of a Counter instruction, into a BCD value.

TOD

A BCD ____________ is an input device that enables a machine operator to adjust a PLC instruction's preset value without having to use a programming terminal.

Thumbwheel switch

Count Down instructions are usually combined with Count up instructions to form a ____________ counter.

Up/Down