Message Communication; Message Communication - Reading - Mitsubishi Electric A1SJ71DN91 User Manual

7. PROGRAMMING
7.5

Message Communication

7.5.1

Message communication - reading

Read
attributes
X0 X0F
Writing
Reading
X2 Y12
<>
=
This section describes a sample sequence program to conduct message communication.
The following sample program represents a case of reading attributes of expected packet rate
for the polling connection from the station number 3.
X2 Y12
K0 D11
K0 D11
MOVP
H101
MOVP H0503
MOVP K2
MOVP K9
TOP H0 H110 D0
FROMP H0 H120 D10
Error processing program
/P D14 K2
MOVP D14
FROMP H0 H130 D20
−
7 7
MELSEC-A
D0
Set attribute read
command
D1
Station number 3 slave station
Class ID =5
D2
Instance ID = 2
D3
Attribute ID = 9
K4
Write request data to
buffer memory
SET Reading
SET
Y12
Set message
communication request
K5
Read result from buffer
memory
DECP D14
Calculate read length of
received data
D14
INCP D14
Z
K0Z
Read received data
RST Y12
Reset message
communication request
RST Reading
RST Read
attributes