Stopping/Resetting Communications After; Unit Ver. 1.0 Or Later - Omron NE1A-SCPU01 - 07-2009 Operation Manual

Safety Master Function
EPI (Data Expected Packet Interval) Setting
Note
4-4-3 Stopping/Resetting Communications after an Error

Unit Ver. 1.0 or Later

Setting the Operating Mode after a Communications Error
Mode after
communications error
Automatic recovery
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.
The time set here affects the network reaction time.
•
Refer to SECTION 11 Remote I/O Communications Performance and Local I/O
Response Time and to Section 2 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 (including Controllers that sup-
port EtherNet/IP), the user can specify whether to stop or continue I/O com-
munications 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 user program or a Net-
work Configurator.
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.
Description
Section 4-4
85