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AVEVA™ Plant SCADA

SNMPII Protocol-specific Parameters

  • Last UpdatedDec 17, 2021
  • 2 minute read

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UNINTENDED EQUIPMENT OPERATION

Do not change these protocol parameters, except on the advice of Technical Support for this product.

Failure to follow these instructions can result in death, serious injury, or equipment damage..

Note: Always seek the advice of Technical Support personnel for this product regarding undocumented features.

This section describes the SNMPII protocol-specific parameters. The parameter values have been set to the usual value for this protocol. You cannot change these values except on the advice of Technical Support for this product.

Note: If you plan on using Include projects and your communications settings are not in the main project, you need to set the driver-specific parameter ComSettingsInInclude to 1.

Parameter

Description

[SNMPII]Block

This value is not used by the driver.

[SNMPII]Delay

The period (in milliseconds) to wait between receiving a response and sending the next command.

Allowable Values: 0 to 300 (milliseconds)

Default Value: 0

[SNMPII]MaxPending

The maximum number of pending commands that the driver holds ready for immediate execution.

Allowable Values: 1 to 256

Default Value: 2

You need to adjust MaxPending so that at least 2 DCBs are available per unit on a port; for example, if you have 10 devices on a port, Maxpending should have a minimum value of 20, or else when one unit is offline it can cause significant slowing of the responses from other units.

[SNMPII]PollTime

The interrupt or polling service time (in milliseconds). Setting the polling time to 0 puts the driver in interrupt mode.

Allowable Values: 500 to 2000 (milliseconds)

Default Value: 1000

[SNMPII]Retry

Not used by the driver. See the driver-specific parameter [SNMPII]SnmpRetry.

[SNMPII]Timeout

Not used by the driver. See the driver-specific parameter [SNMPII]SnmpTimeout.

[SNMPII]WatchTime

The period (in seconds) that the driver uses to check the communications link to the I/O Device.

Allowable Values: 0 to 128 (seconds)

Default Value: 30 (seconds)

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