30
3 CONFIGURATION OF INSTRUCTIONS
Source (s)
A source is data used in an operation.
The following source types are available depending on the device specified in an instruction:
The instructions explained in this manual use special data. Refer to the explanation for each instruction and use data
correctly.
Destination (d)
Data after the operation are stored to a destination.
Set a device in which data are to be stored to a destination.
The instructions explained in this manual use special data. Refer to the explanation for each instruction and use data
correctly.
Number of devices and number of transfers (n)
Data such as a channel number, loop number, read data length, and logging setting number are set to the number of devices
and number of transfers (n).
Executing condition (EN)
An input variable EN inputs an executing condition of an instruction.
Execution result (ENO)
An output variable ENO outputs an execution result.
For details of the configuration of instructions for labels and structures, refer to the following.
MELSEC-Q/L/F Structured Programming Manual (Fundamentals)
Type
Description
Constant
Specifies a numeric value used in an operation. Constants are set during
programming so that they cannot be changed while the program is being
executed. Perform index modification when using them as variable data.
Bit device and word device
Specifies the device in which the data used in the operation are stored. Data
must be stored to the specified device before executing the operation. By
changing the data to be stored to the specified device while a program is
being executed, the data used in the instruction can be changed.
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