IDEC High Performance Series - Manual (Page 658)

Chapter 6
640
External Device Setup Manual
4 1:N Communication Operation
4.1 1:N Communication Operation
When 1:N Connection is selected as Connection in the Select/Change Host I/F Driver dialog box or Select/Change Communication
Driver dialog box, multiple external devices (PLCs, etc.,) can be connected to a single MICRO/I or Touch. These instructions
describe operation when a host communication error or communication error occurs during 1:N communication. When using HG1F/
2F/2S/3F/4F communication with the MICRO/I is stopped as soon as a host communication error occurs. When using HG2G-S/-5S/-
5F, HG3G/4G or Touch, it is possible to set the specific action to be taken when a host communication error or communication error
occurs. For details about settings, refer to Chapter 6 "3.2.3 Settings when a communication error occurs" on page 631.
4.1.1 When "Ignore communication errors and continue operation" is disabled
When “Ignore communication errors and continue operation” is enabled, if the MICRO/I or Touch fails to connect to the target exter-
nal device, an error message and the Station No. of the external device that failed to connect are displayed, and MICRO/I or Touch
operation stops.
4.1.2 When "Ignore communication errors and continue operation" is enabled
When “Ignore communication errors and continue operation” is enabled, if the MICRO/I or Touch fails to connect to the external
device, it does not stop operation. Information related to communication errors is stored in the devices set in “Batch monitor error
information for all Station No.'s” and “Individually monitor error information for each Station No.”
Settings Action when MICRO/I or Touch fails to connect to the external device
None Displays an error message and stops operation.
An Ack (acknowledge) button is not displayed in the error message. The error message is dis-
played until communication with the PLC recovers.
Reading from an external device under the conditions in which a communication error occurred
The device value of an external device that caused a communication error is maintained as the last read value until the dis-
played screen changes. When the screen changes, all device values of the external device that caused the communication error
turn to 0.
Writing to an external device under the conditions in which a communication error occurred
If data is written to an external device that is experiencing a communication error, values displayed on the MICRO/I or Touch
are changed, but are not written to the external device. Values displayed on the MICRO/I or Touch are maintained until the
screen changes, but are initialized to 0 when the screen changes. Values written on the MICRO/I or Touch during a communi-
cation error are not written to the external device even after the MICRO/I or Touch has recovered from the communication
error.