Basic Parameters

[DNPR]Block

1-256

1

Dynamic I/O server blocking is adjustable by the user up to 256 bytes. e.g. [DNPR]Block=256

This allows DCBs to be blocked together in the I/O server and make fewer requests down to the driver.

[DNPR]ConnectionTimeout

1000 to 65534 (ms)

8000

The maximum amount of time to allow the low level transport for the driver to attempt a connection.

[DNPR]Delay

0-300 (ms)

0

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

[DNPR]
EventPollPeriodDefault

0 to 4,000,000 (seconds)

60 Sec

Default period to poll devices for event class data. Integrity poll will poll for all classes (event and static data), and occurs after every EventPollRatioDefault event polls.

If the value is set to zero then the polling mode in the Citect.ini parameter [DNPR]
ResponseModeDefault will be disabled. The device will stay offline until an integrity poll is forced out or an unsolicited message from the device is coming in.

See "Device Polling Regime" for an example.

This parameter can be over-written by the parameter [<unit>]EventPollPeriod.

Note: This INI parameter can be overwritten if the "Minimum Update Time" field for the I/O Device is greater than 0. (This option is only available with Plant SCADA from version 7.20.)

[DNPR]MaxPending

0-32

16

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

[DNPR]Polltime

50-1000 (ms)

200

The frequency with which messages are processed to/from the driver to the RTUs.

It is recommended this value not be changed.

[DNPR]Retry

0-8

1

Default number of application layer retries for all I/O devices as well as physical transport writes allowed before a channel is placed offline.

This parameter can be over-written by the parameter [<unit>]Retry.

[DNPR]SCADAAddress

0-65534

3

Defines the DNP Address for Plant SCADA. If a value for this parameter is not provided, a popup box will appear at startup.

This parameter can be over-written by the parameter [<unit>]SCADAAddress.

[DNPR]Timeout

500-32767 (ms)

5000

Default application layer timeout (in milliseconds) for all I/O devices.

This parameter can be over-written by the parameter [<unit>]Timeout.

[DNPR]WatchTime

5-128 Sec

10

The frequency (in seconds) with which the I/O server checks the communications link to an I/O device if the device is offline.