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PLC User's Manual - Positioning Control Edition
Built-in Positioning Functions
6 Mechanical Zero Return (DSZR/ZRN Instruction)
6.1 Types of Mechanical Zero Return Instructions
B - 88
6. Mechanical Zero Return (DSZR/ZRN Instruction)
6.1 Types of Mechanical Zero Return Instructions
If forward rotation pulses or reverse rotation pulses are being output, the positioning instruction of the PLC will
increase or decrease the current value of the current value register.
When turning off the power of the PLC, however, the current value stored in the current value register will be
erased. For this reason, after turning on the power again, be sure to adjust the current value of the current
value register to the current position of the machine.
The built-in positioning function uses the DSZR/ZRN instruction (zero return instruction) to adjust the value of
the current value register to the current mechanical position.
Compared with the ZRN instruction, the DSZR instruction has additional functionality.
Absolute position detection system:
If the MR-H, MR-J2, MR-J2S, or MR-J3 servo amplifier (with absolute position detection function)
manufactured by Mitsubishi is used, the current position value will be retained even after power-off.
To use the absolute position detection system, zero return is required to be performed only once. The PLC
can then read the current position value of the servo motor with the FNC155 (DABS) instruction. With this
method, it is not necessary to perform zero return every time after power-on.
DSZR instruction ZRN instruction
DOG search function
3
-
DOG signal logical NOT
3
-
Zero return using zero-phase signal
3
-
Zero point signal logic reverse
3
-