Allen-Bradley Ethernet Driver
Demote on Failure: When enabled, the device is automatically taken off-scan until it is responding again.
Tip: Determine when a device is off-scan by monitoring its demoted state using the _AutoDemoted system
tag.
Timeouts to Demote: Specify how many successive cycles of request timeouts and retries occur before the
device is placed off-scan. The valid range is 1 to 30 successive failures. The default is 3.
Demotion Period: Indicate how long the device should be placed off-scan when the timeouts value is reached.
During this period, no read requests are sent to the device and all data associated with the read requests are
set to bad quality. When this period expires, the driver places the device on-scan and allows for another attempt
at communications. The valid range is 100 to 3600000 milliseconds. The default is 10000 milliseconds.
Discard Requests when Demoted: Select whether or not write requests should be attempted during the off-
scan period. Disable to always send write requests regardless of the demotion period. Enable to discard writes;
the server automatically fails any write request received from a client and does not post a message to the Event
Log.
Device Properties - Communications Parameters
Port: Secify the port number that the remote device is configured to use. The default setting is 2222.
Request Size: Specifies the maximum number of bytes that may be requested from a device at one time. To
refine the driver's performance, configure the request size to one of the following settings: 32, 64, 128, 256, 512,
1024, or 2000 bytes. The default is 512 bytes.
Tip: For Boolean arrays, the block size is the bit equivalent (or, block size multiplied by 8). For example, a
block size of 512 bytes is equal to 512 * 8 = 4096 bits.
Device Properties - Protocol Parameters
Destination Node Address (DST): Specify the destination node address. For DF1 gateway applications, select
the node address of the destination device. For non-DF1 gateway applications, leave the node address at the
default setting of 0.
Note: The destination device is the DH+ or DH-485 device.
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