Omron CJ - REFERENCE MANUAL 02-2010 Reference Manual page 834

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3. Instructions

• Do not read or write the system word (C) from any other instruction. HKY(212) will not operate

correctly if the system word is accessed by another instruction. The system word is not initialized by

HKY(212) in the first cycle when program execution starts. If HKY(212) is being used from the first

cycle, clear the system word from the program.

• I/O refreshing must be performed with the I/O Unit connected to the hexadecimal keypad after each

HKY(212) instruction is executed. If the cycle time is short, operation may not be correct depending

on the ON/OFF response time of the I/O Unit. If necessary, use an I/O Unit with a short ON/OFF

response time or use the minimum cycle time function to adjust the cycle time. Do not connect the

hexadecimal keypad to the following Units.

• Basic I/O Units or High-density I/O Units mounted in a SYSMAC BUS Remote I/O Slave Rack

• Communications Slaves (DeviceNet or CompoBus/S Slaves)

• HKY(212) determines which key is pressed by identifying which input is ON when a given selection

signal is ON, so it can take anywhere from 3 to 12 cycles for one hexadecimal digit to be read. After

the key input is read, HKY(212) starts over and reads another digit in the next 3 to 12 cycles.

• When executed, HKY(212) begins reading the key input data from the first selection signal,

regardless of the point at which the last instruction was stopped.

• The two-word register in D1 and D1+1 operates as an 8-digit shift register. When a key is pressed on

the ten-key keypad, the corresponding hexadecimal digit is shifted into the least significant digit of

D1. The other digits of D1, D1+1 are shifted left and the most significant digit of D1+1 is lost.

• When one of the keypad keys is being pressed, input from the other keys is disabled.

• There is no restriction on the number of times that HKY(212) can appear in the program (unlike the

CQM1H Series).

Example Programming

In this example, HKY(212) reads up to 8 digits of hexadecimal data from a hexadecimal keypad and

stores the data in D0 and D1. The hexadecimal keypad is connected through CIO 100 (allocated to a

CS1W-ID211 16-point DC Input Unit) and CIO 200 (allocated to a CS1W-OD211 16-point Transistor

Output Unit). D32000 is used as the system word.

Always ON Flag

CS/CJ/NSJ Series Instructions Reference Manual (W474)

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