Mitsubishi Electric MELSEC-Q Series User Manual page 55

(3) Connecting/disconnecting a cable and powering off/on a device
When the operations listed below are performed, a data link error may momentarily
occur in all the stations and outputs of the connected slave stations may turn off since
all stations on the network will be reconnected. Set output data if needed. (Refer to
Section 5.1.2 (4).)
Network configuration
Star topology
Line topology
Connecting/disconnecting
a cable or power OFF/ON
(4) Output hold when a data link error occurs
To hold the outputs when a data link error occurs, configure the following settings:
•Simple Motion module
Set that the input data from the data link faulty station is held.
Project window
[Ethernet/CC IE/MELSECNET]
•For a head module whose serial number (first five digits) is "12071" or earlier
Set that the output data when a data link error occurs is held.
Project window
[Detailed Setting] button
(This setting is not required for a head module whose serial number (first five digits)
is "12072" or later.)
• Powering a slave station or switching hub off and on
• Connecting/disconnecting an Ethernet cable connected to the switching hub
• Disconnecting an Ethernet cable from a slave station and connecting it to
another slave station or the switching hub
• Disconnecting more than nine stations, or half the number of slave stations or
more in the system
• Changing the network topology when adding a slave station
• Simultaneously powering off/on systems on multiple stations
• Simultaneously connecting/disconnecting Ethernet cables to/from multiple
stations (When a data link faulty station returns, a data link error will occur in all
the stations.)
• Disconnecting more than nine stations, or half the number of slave stations or
more in the system
• Changing the network topology when adding a slave station
Instantaneous
fault on all
stations
[Parameter] [Network Parameter]
[Network Operation Settings] button
[Parameter] [PLC Parameter]
"Error Time Output Mode"
5 - 5
Chapter 5 SYSTEM CONFIGURATION
Operation
"I/O Assignment"