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19 TEST FUNCTION
19.1 External Input/Output Forced On/Off Function
Behavior in forced on/off registration in redundant mode
The reflection of forced on/off does not differ depending on the system or operation mode.
■Forced on/off of input devices
Forced on/off is reflected to input devices when the END processing is executed. The following table lists the behavior of the
input devices within the refresh range or the input devices specified in the tracking transfer setting.
■Forced on/off of output devices
Forced on/off is reflected to output devices when the END processing is executed. The following table lists the behavior of the
output devices within the refresh range or the output devices specified in the tracking transfer setting.
Reflection to external outputs of the standby system
The forced on/off is reflected to output devices of the standby system regardless of the operation mode and settings.
However, for external outputs of the standby system, the reflection is as follows depending on the operation mode and the
output setting of the standby system.
*1 Since cyclic data of the network module is not sent on the standby system, forced on/off is reflected only to the modules mounted on the
main base unit. (Forced on/off is not reflected to external outputs of the remote I/O module regardless of the standby system output
setting.)
Reflection timing of forced on/off registration information to the standby system
This section describes the reflection timing of forced on/off registration information to the standby system.
■When the synchronous tracking mode is used as a tracking mode
The reflection of forced on/off registration information to the standby system delays for one scan (maximum).
■When the asynchronous tracking mode is used as a tracking mode
The reflection of forced on/off registration information to the standby system may delay for several scans.
CPU module operating status
Forced on/off registration is allowed regardless of the CPU module operating status. However, when a stop error has
occurred, the external outputs are turned off regardless of the forced on/off registration setting. While the operating status of
the CPU module is STOP due to a stop error, forced on/off is enabled only for the input devices. If the CPU module is powered
off and on or is reset, all the forced on/off registration information will be canceled.
Item Operation
Input devices within the refresh range Forced on/off is reflected to the input devices after the data is refreshed from the module.
Input devices specified in the tracking
transfer setting
Forced on/off is reflected to output devices after the transferred device data is reflected to the standby system.
Item Operation
Output devices within the refresh range After forced on/off is reflected to the output devices, data is refreshed to the module.
Output devices specified in the tracking
transfer setting
Forced on/off is reflected to the output devices on both systems after the device data transferred from the control
system is reflected.
Operation mode Standby system output
setting
Reflection to output devices of
the standby system
Reflection to external outputs of
the standby system
Backup mode Disable Reflected Not reflected
Enable Reflected
*1
Separate mode Disable
Enable
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