AVEVA™ Plant SCADA

Common Parameters

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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.

Parameters grouped beneath the [ABLMXEIP] category in the citect.ini file are global and impact MicroLogix system PLCs.

The following table describes the common citect.ini driver parameters.

[ABLMXEIP] Parameter	Allowable Values	Default Value	Description
Block	1 to 248	248	A value (bytes) used by the Plant SCADA I/O server to determine if two or more packets can be blocked into one data request before being sent to the ABMLXEIP driver. Do not make this value greater than 248, as this is the maximum number of bytes that can be requested from the device. For this setting to have a bearing, the PROTDIR.DBF file will need to be altered.
Delay	0 to 300	20	The time delay (in milliseconds) between the delivery of each message. Use this parameter to avoid messages being sent in bursts.
MaxPending	1 to 256	5	The maximum number of pending commands that the Plant SCADA ABMLXEIP driver holds ready for immediate execution.
Retry	0 to 5	3	The number of times to retry a command after a timeout. This is also the maximum number of total retries before the device is considered offline.
Timeout	100 to 30000	3000	Specifies how many milliseconds to wait for a response before considering a write or polling request to be invalid and displaying an error message in Plant SCADA. Connection timeout will be TimeOut * 3.
Watchtime	5 to 30	30	The period (in seconds) that the Plant SCADA ABMLXEIP driver uses to check the communications link to the MicroLogix system and attempts to bring offline units back online. Also determines the rate of STATUS_UNIT commands to the driver. See Configuring Redundancy.