Mitsubishi Electric F920GOT-BBD-K-E, Hardware Manual

Page: 389 / 592

GOT-F900 SERIES (CONNECTION) Connection of Microcomputer 14
14-13
11
C
o
n
n
e
c
ti
on
of
ME
L
S
E
C
-Q
Se
ri
e
s
PL
C
12
Co
n
n
e
c
ti
o
n
o
f
FX Se
ri
e
s
Po
s
it
io
n
in
g
13
C
o
n
n
e
c
ti
on o
f
FR
EQ
R
O
L
In
ve
rt
er
14
C
onn
ec
ti
o
n
of
Mi
cr
o
c
o
m
-
put
e
r
15
C
o
nn
ec
ti
o
n
of
S
YSM
A
C
C
Se
ri
e
s
PL
C
16
C
o
nne
c
ti
o
n of
F
L
EX-
PC N
Se
ri
e
s
PL
C
17
C
o
nn
ect
io
n o
f
M
a
c
h
in
e
C
on-
troll
e
r
18
C
o
nn
ec
ti
o
n
of
FP
Se
ri
e
s
PL
C
19
C
o
n
n
e
c
ti
on o
f
S
L
C
500
Se
ri
e
s
PLC
20
C
o
n
n
e
c
ti
on
of
SI
M
A
T
IC S7
Se
ri
e
s
PLC
14.5 Communication Command
This section explains commands used in communication.
14.5.1 Outline of Communication Procedure
1) Command transmission (outline)
Communication between the GOT-F900 units and the microcomputer is executed in the procedure in
which the microcomputer sends a command and a GOT-F900 unit returns a response to it. While a
GOT-F900 unit is sending a response to the microcomputer, any GOT-F900 unit cannot receive any
new command from the microcomputer.
If an error occurs, the GOT-F900 returns the NAK code as the response. The contents of the error
can be seen when the special memory is read.
2) Outline of interrupt
As an exception of the communication procedure described above, when a certain event occurs in
itself or receiving an interrupt code from another GOT unit, the GOT unit immediately sends the
interrupt code to the microcomputer.
However, while sending a response to the microcomputer, the GOT unit waits until sending is
finished, then sends the interrupt code after that. An interrupt code may be sent while a command is
being received.
If an event such as change of the ON/OFF status of a certain bit data or a screen changeover occurs
by a touch key on the screen, an interrupt code is sent.
Microcomputer
1st GOT
Command
to 1st GOT
Response
Response
Command
to 2nd GOT
2nd GOT
Command
to 2nd GOT
Response
Command
to 3rd GOT
3rd GOT
Response
Command
to 3rd GOT
Command
to 3rd GOT
Response
Response
1st GOT
Response
2nd GOT
Command
to 2nd GOT
3rd GOT
Response
Command
to 2nd GOT
Command
to 1st GOT
Response
Interrupt
Event occurs.
Interrupt
Interrupt
If receiving an interrupt code from another
GOT while sending back a response, the
GOT sends the interrupt code after
finishing sending back the response.
If receiving an interrupt code from another GOT
in any status except sending back a response
(while receiving a command, for example), the
GOT immediately sends the interrupt code.
If an event occurs while sending
back a response, the GOT
sends an interrupt code after
finishing sending back the
response.
Microcomputer