Stopping/Resetting Communications After An Error - Omron NE1A Series Manual

Safety Master Function
EPI (Data Expected Packet Interval) Setting
4-4-4

Stopping/Resetting Communications after an Error

Setting the Operating Mode after a Communications Error
Mode after
communications error
Automatic recovery
Stop only the connection
where the error occurred.
Stop all connections
72
Set the interval to communicate safety data between the NE1A-series Safety
Master and Safety Slaves. Devices that transmit data to network are moni-
tored to confirm they can transmit the data within the set time interval and
devices that receive data are monitored to confirm they can receive normal
data within the data transmission interval using timers. If the data is not
received, the connection is disconnected and a switch is made to the safety
state.
Note
•
The time set here affects the network reaction time.
Refer to Section 9 Remote I/O Communications Performance and Local I/O
Response Time and to Section 3 Constructing a Safety Network in the DeviceNet
Safety System Configuration Manual (Cat. No. Z905) for information on the net-
work reaction time.
•
The minimum set for the EPI is either the cycle time of the Safety Network Con-
troller or the cycle time of the Safety Slaves (always 6 ms), whichever is greater.
The minimum setting for the EPI will therefore be affected if the cycle time of the
Safety Network Controller is longer then 6 ms.
With Controllers with unit version 1.0 or later, the user can specify whether to
stop or continue I/O communications after the connection times out during
safety I/O communications with the safety slave. If I/O communications are
stopped because of a timeout error, the communications can be restarted
from the logic program or a Programming Device.
With Pre-Ver. 1.0 Controllers, I/O communications are continued (automatic
recovery).
One of the following modes can be selected to specify the Controller's opera-
tion when there is a connection timeout during safety I/O communications with
the safety slave.
Specify this mode to re-establish the safety I/O connection for a connection in which a
safety I/O communications error has occurred.
If the cause of the communications error is eliminated, safety I/O communications will
restart automatically.
Specify this mode to keep safety I/O communications stopped on a connection in which a
safety I/O communications error has occurred. I/O communications will continue for nor-
mal connections.
To restart safety I/O communications for connections in which I/O communications have
been stopped, use the Network Configurator to send a command to restart communica-
tions. It is also possible to write a logic routine in the logic program in advance to turn ON
the specified Safety I/O Communications Restart Flag and restart communications with a
specified trigger bit.
Specify this mode to stop safety I/O communications with all safety slaves stopped after
a safety I/O communications error has occurred.
To restart safety I/O communications with the safety slaves after I/O communications
have been stopped, use the Network Configurator to send a command to restart commu-
nications. It is also possible to write a logic routine in the logic program in advance to turn
ON all of the Safety I/O Communications Restart Flags and restart communications with
a specified trigger bit.
Description
Section 4-4