Mitsubishi MELSEC QJ71C24, Руководство пользователя

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MELSEC-Q
5 DATA COMMUNICATION USING THE MELSEC COMMUNICATION
PROTOCOL
(4) Monitoring the programmable controller CPU
This function monitors the operating status of the programmable controller CPU
and the data in the device memory.
The programmable controller CPU status and the device memory data can be
sent to the external device at fixed intervals, when an error occurs in the machine
equipment, or when certain conditions are satisfied.
This function reduces the data read processing load on the external device side.
(5) Sending data from the programmable controller CPU to the
external device
A function for requesting data transmission from the programmable controller
CPU to the external device is called the on-demand function.
Urgent data that must be forwarded to the external device can be sent as on-
demand data to the external device by starting up from the programmable
controller CPU.
5.1.2 Message format and control procedure for data communication
The data communication functions using the MC protocol correspond to the data
communication functions using the dedicated protocol for the conventional products
listed below.
• A series computer link module
• QnA series serial communication module
Therefore, the message format and control procedure are the same as when
accessing the programmable controller using these conventional modules.
The external device side can access the Q series programmable controller with a
program used for accessing the programmable controller via a conventional module.
(Example)
E
N
Q
H L H L H L H L
0 0 0 1 Q R 0 X 0 0 0 0 4 0 0 2 2 7
05
H
30
H
30
H
30
H
31
H
51
H
52
H
30
H
58
H
30
H
30
H
30
H
30
H
34
H
30
H
30
H
32
H
37
H
32
H
S
T
X
H L H L
0 0 0 1 1 2 3 4 B C D
02
H
30
H
30
H
30
H
31
H
31
H
32
H
33
H
34
H
42
H
43
H
44
H
H L
8 9
39
H
38
H
E
T
X
03
H
A
41
H
(Command message for A compatible 1C frame) (Response for A compatible 1C frame)
St
a
tio
n N
o
.
PC No.
C
o
mm
and
M
es
sag
e w
a
it
Head device
No. of device
points
2 characters
(hexadecimal)
Su
m
c
he
ck
cod
e
Su
m
c
he
ck
cod
e
S
tat
ion N
o.
PC No.
Data for the number
of device points
Number of device
points × 4 characters
POINT
The following manual is available for performing data communication using the MC
protocol.
MELSEC-Q/L MELSEC Communication Protocol Reference Manual (sold
separately)
5.1.3 Programmable controller CPU setting for performing data communication
Data communication using the MC protocol is achieved by performing the GX
Developer settings indicated below on a PC, performing the system settings by the GX
Configurator-SC, and registering the settings to the programmable controller.
(1) Settings using the GX Developer (Required)
Perform the I/O assignments and switch settings indicated in Section 4.5 and
write the parameters to the programmable controller CPU where the Q series
C24 is installed.
5