"Devices" And "Instruction Symbols" In Programming - Mitsubishi Electric MELSEC Q Series Quick Start Manual

6 Programming
Create a program (sequence program) for sequence control.
 "Devices" and "instruction symbols" in programming
Combine "devices" and "instruction symbols" to create a sequence program.
1.
Devices
Devices include bit devices and word devices.
1 Bit device: handles one-bit information such as ON/OFF of a switch or a lamp.
ON/OFF of a switch
Examples of bit device
Device name
Input
Output
Internal relay
Timer (contact)
Counter (contact)
2 Word device: handles 16-bit information such as numeric values and character strings.
Numeric value
Examples of word device
Device name
Data register
Timer (current value)
Counter (current value)
14
ON/OFF of a lamp
Device
symbol
X Receives a signal from an external device such as a switch.
Y Outputs a signal to an external device such as a lamp
M Temporarily saves data status in programs.
Used to measure time (when the set time comes, the contact is set to
T
ON).
Used to count the number of times the input condition turns from OFF
C to ON (when the counter reaches the set number, the contact is set to
ON).
Character string
Device
symbol
D Registers numeric values and character strings.
T Used to measure time (stores the current value of measuring time).
Used to count the number of times the input condition turns from OFF
C
to ON (stores the current value of the counter).
Description
Description