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Failsafe Timer Functionality
Overview
The Failsafe Timer tab configures the I/O failsafe timer. The Failsafe Timer is enabled on a global
basis and provides a trigger mechanism that can be configured for each channel when no I/O traffic
has occurred for the specified amount of time. This traffic information would include any statistical
data updates based on the refresh timer for Statistics.A Failsafe Action can be configured for each
Digital Output channel, each Serial Signal Output pin (DTR and RTS), and each Relay channel to
either Activate or Deactivate the output.
The Failsafe Timer has a different function when I/O Extension is enabled for Digital Output
channels, Relay channels, or the Serial Signal Output pins (DTR and RTS). For I/O Extension, the
Failsafe Timer provides a per channel or per serial signal output pin trigger mechanism that is
activated when there are no TCP sessions for the specified amount of time.
Field Descriptions
Configure the following parameters:
Next Request Delay A delay, in milliseconds, to allow serial slave(s) to re-enable receivers before
issuing next Modbus Master request.
Range: 0-1000
Default: 50 ms
Enable Serial
Modbus Broadcasts
When enabled, a UID of 0 (zero) indicates that the message will be broadcast to
all Modbus Slaves.
Default: Disabled
Request Queuing When enabled, allows multiple, simultaneous messages to be queued and
processed in order of reception.
Default: Enabled
Embedded When this option is selected, the address of the slave Modbus device is
embedded in the message header.
Default: Enabled
Remapped Used for single device/port operation. Older Modbus devices may not include a
UID in their transmission header. When this option is selected, you can specify
the UID that will be inserted into the message header for the Modbus slave
device. This feature supersedes the Broadcast feature.
Default: Disabled
Remap UID Specify the UID that will be inserted into the message header for the Slave
Modbus serial device.
Range: 1-247
Default: 1