Fixed Cycle Pulse Output - Mitsubishi Electric MELSEC-Q/L Programming Manual

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Fixed cycle pulse output

Frequency or the number of the device where frequency is stored (BIN 16 bits)

Outputs count or the number of the device where the outputs count is stored (BIN 16 bits)

(D): Number of the device to which pulses are output (bits)

Internal device

*1 Only output (Y) can be used.

Processing details

• Outputs a pulse at a frequency designated by n1 the number of times designated by n2, to the output module with the

output signal (Y) designated by (D).

• Frequencies between 1 to 100Hz can be designated by n1. If n1 is other than 1 to 100Hz, the PLSY instruction will not be

• The number of outputs that can be designated by n2 is between 0 to 65535 (0000H to FFFFH). If n2 is set to "0", pulses are

continuously output.

• Only an output number corresponding to the output module can be designated for pulse output at (D).

• Pulse output commences with the command rising edge of the PLSY instruction. Pulse output is suspended when the

PLSY instruction command goes OFF.

• With the PLSY instruction, the argument device data is registered in the work area of the CPU module and

counting operation is processed as a system interrupt. (The device data registered in the work area is

cleared by turning the execution command OFF, or turning the STOP/RUN switch STOPRUN.) For this

reason, the pulses that can be output must have longer ON and OFF times than the interrupt interval of the

CPU module. The interrupt interval of the CPU module is 1ms.

• Do not change the argument for the PLSY instruction during pulse output directed by the PLSY instruction

(while the execution command is ON). To change the argument, turn OFF the execution command.

• The PLSY instruction can be used only once in all programs executed by the CPU module. The second and

the subsequent PLSY instructions are not processed.

Operation error

• In any of the following cases, an operation error occurs, the error flag (SM0) turns ON, and an error code is stored into SD0.

Error details

The device specified by (D) exceeds the range of the corresponding device.

6.8 Other Convenient Instructions

6 BASIC INSTRUCTIONS