External Signal Selection Function - Mitsubishi Electric MELSEC-LD77MS2 User Manual

14.4 External signal selection function

Setting item
External
input signal
Pr.80
selection
The "external signal selection function" is used to select from the following signals
when using the upper/lower limit signal and near-point dog signal.
• External input signal of servo amplifier
• External input signal via CPU (buffer memory of LD77MS)
When the external input signal via CPU (the buffer memory of LD77MS) is used, the
external input signal status of Simple Motion module can be operated by connecting
the limit switch to input module and by operating the buffer memory of sequence
program. When the external input signal via CPU (the buffer memory of LD77MS) is
used, operation is affected by the PLC scan time.
The details shown below explain about the "External signal selection function".
[1] Parameter setting details
[2] Precautions during parameter setting
[3] Control details
[4] Program example
[1] Parameter setting details
The setting details of the "External signal selection function" are shown in the
following table.
Setting value
Set the external signal selection.
1 1: External input signal of servo amplifier
2: Buffer memory of LD77MS
Setting details
14 - 9
Chapter 14 Common Functions
Buffer memory address
LD77MS2
LD77MS4
32+150n
n: Axis No.-1
LD77MS16