Switching The Mode From An External Device; Mode Switching Procedure - Mitsubishi MELSEC L Series User Manual

15.5 Switching the Mode from an External Device

15.5.1 Mode switching procedure

External device
Programmable
controller CPU
Mode switching in progress
CH ERR. communication error
Q series C24 ready
Switch setting error, mode switching
error storage area (address 203
Buffer memory special applications area
Data communications initialization
setting area described in
User's Manual (Basic).
Addresses 93 to 121 /133
H H
15 - 10
This section shows how the Q series C24 mode is switched from an external device.
The following explains the procedure for switching the Q series C24 mode from an
external device.
Mode switching
1 For the message format, refer to the MELSEC-Q/L MELSEC
command
Communication Protocol Reference Manual.
message
Mode switching
response
message
X6/XD
XE/XF
X1E
)
H
Data
to 1C1
H H
communications
possible
1 Inform in advance all the connected devices that data communications by
mode switching cannot be performed.
2 When XE and XF were turned on, check the error contents as described in
the User's Manual (Basic) and take the corresponding action.
• Checking of mode switching designation contents for buffer memory mode
switching area and writing of mode switching designation contents within
the range that can be designated.
• Re-execution of mode switching
3 When the mode was switched from an external device, after mode switching
is complete, read and write the buffer memory special applications area
shown below from the programmable controller CPU.
• Switch setting error, mode switching error storage area (address: 203
• Data communications initialization setting areas (addresses: 93
/133 to 1C1
H
4 After checking that mode switching was completed normally, inform all the
connected devices that data communications are possible and restart data
communications.
(Normal end)
Approx. 400 ms
3
FROM
Data communications impossible
) described in the User's Manual (Basic).
H
15 SWITCHING THE MODE AFTER STARTING
2
(Only when normal)
3
TO
default value modification
(Performed only when necessary)
4
Data communications
possible
)
H
to 121
H H
15 - 10