[opcae_servername]

[opcae_servername] pollCount

Type: unsigned integer
Default: 32
Range: >0

Defines the number of data points that can be polled at once. If several polling requests are queued they will be processed in the next driver cycle.

[opcae_servername] prefix

Type: string
Default: AE_

Defines the prefix which is used in all automatically generated datapoint elements. If the same items exist in two or more servers, the prefix has to be different for each of the servers.

[opcae_servername] simpleEventDp

Type: string
Default: DP prefix+SimpleEventNotifications

[opcae_servername] twoStateConditionsOnly

Type: bool
Default: 0
Range: 0|1

Use this config entry to inform the client that the server only provides boolean alarms. If the server only provides boolean alarms, you cannot create master datapoints using the panels or assign server items to client items. You have to create the configuration manually in the PARA or import it by using the ASCII manager. The OPC A&E client automatically creates a master datapoint with two alert ranges (0=inactive, 1=active) at run time.

[opcae_servername] watchdog

Type: string string int
Range: <wdMsg> <wdTargetDp> <wsTimeout>

The monitoring of the OPC AE connection works in the following way:

The OPC AE server sends a SimpleEvent of a special format (watchdog event) to the client periodically.
The arrival of a watchdog event at the client resets a timer.
If the timer expires before a new watchdog event is risen by the server a binary DPE is set (1). This signal can then be used for further processing (redundancy switch, raising an alarm, archiving).

Only changes in the state of the watchdog will be sent to the system to minimize traffic Note: As many watchdogs as desired can be introduced for one server by just adding the appropriate number of config entries (see example). The config entry must be specified like this: watchdog = <wdMsg> <wdTargetDp> <wsTimeout> wdMsg = string that identifies the watchdog message within the SimpleEvent. It can either be the entire message or part thereof; no wildcards are allowed. wdTargetDp = DP name of the binary DPE that is set to TRUE in case of absence of the watchdog signal. wdTimeOut = timeout in ms Example watchdog = "WATCHDOG_PLC1" "wdDpPlc1" 10000 watchdog = "WATCHDOG_PLC2" "wdDpPlc2" 20000 watchdog = "WATCHDOG_PLC3" "wdDpPlc3" 30000 Redundancy In order for this mechanism to work in a redundant system, the following steps must be taken:

The target DP must exist twice (for "targetDP" there must be "targetDP_2"). The AE client will automatically set the correct DP.
To set the data points also on the passive system, there is an entry necessary in the config.redu file. The watchdog DPs must be declared as "forward DPs" (see fwdDp and fwdDpType).