KB-30910: I/O Tags reading algorithm
Question: How does the I/O tags reading algorithm work? Solution: The Driver scans the I/O Tags so that the first tag to be read is the one at the top of the list, and it will be read again only after the remaining tags are read. The Driver checks if: - The Tag's AllowRead property is in True; - ...
- KB-30901: Behavior of I/O Tag when AdviseType property is set to 1-AdviseWhenLinked
Question: What is the behavior of AdviseType property when set to 1-AdviseWhenLinked? Solution: When this property is set to 1-AdviseWhenLinked, the I/O Tag is only updated when the AllowRead is True and if it is linked to an active object, such as a Display on an open screen, for example. This ...
- KB-30893: Values of an I/O Tag used on a script not being updated
Question: Why are the values of an I/O Tag used on a script not being updated? Solution: To update the values of the tag's Value property, we recommend that you use links instead of scripts. However, when using scripts, you must set the I/O Tag's AdviseType property to AlwaysInAdvise.
- KB-30708: Indicating which IP the Driver is connected to
Question: How can I indicate which IP the Driver is connected to? Solution: To do so, you can use the IOKit's IO.Ethernet.IPSelect tag that indicates which IP is active. This tag can be used in the Ethernet folder via TagBrowser.
- KB-29747: Supervising the communication between E3 and a PLC
Question: How can I configure an alarm to be triggered when the communication between E3 and a PLC is offline? Solution: There are two ways to do so: - When the PLC can inform the communication status, you can read this information by an I/O Tag; - You can use IOKit's tags and supervise their va ...
- KB-38291: Setting the tags' N parameters at run time
Question: Can I configure the tags' N parameters at run time? Solution: Yes, you can.
- KB-36510: Application does not communicate properly when using a runtime license
Question: When using a development license, the application communicates properly with the driver. However, scripts errors occur and the communication with some tags does not work when using a runtime license. Why does this happen? Solution: This can happen because the application tries to comm ...
- KB-26778: Scale of values between CLP and application
Question: How can I create a scale of values between a CLP and an application? Solution: To do so, you must use the I/O Tag's scale. For example, if you want to display 1.000 on the application when the CLP's value is 10.000, you must perform the following configuration: IO: min: 0 max: 10.000 ...
- KB-37531: Setting Drivers with the ShareServer property enabled
Question: When enabling the ShareServer property on several Drivers, is it necessary to set all these drivers or just one of them? Solution: No, you do not have to set all Drivers. The settings of the first Driver to be activated with the ShareServer property enabled are applied to the remaining ...
- KB-26752: Working with the I/O Driver's ShareServer property
Question: How does the I/O Driver's ShareServer property work? Solution: If this property is set to True, the driver shares its execution among other I/O Driver objects that have the same string in DriverLocation. Thus, only the first configured I/O Driver will execute the communication's start ...
- KB-30479: Changing the names of an I/O Tag's bits
Question: How can I change the names of an I/O Tag's bits (bit00, bit001, bit002, etc.)? Solution: It is not possible to do so.
- KB-35995: Simultaneously communicating to different devices
Question: Can I communicate simultaneously to several devices that use different protocols? Solution: Yes, you can. To do so, you must use drivers that correspond to the different protocols used by each device.
- KB-28960: Fail when refreshing tags values
Question: In an application, tags that are in scripts do not refresh their values when executing E3. Why does this happen? Solution: To fix the problem, you must edit the tags' AdviseType property to AlwaysInAdvise.
- KB-26460: Inserting more than one I/O Driver on E3 version 2.5 in DEMO mode
Question: Can I insert more than one I/O Driver on E3 version 2.5 in DEMO mode? Solution: Yes, you can. However, in DEMO mode, you can insert only 20 I/O Tags and the communication time is limited to up to 2 hours.
- KB-28061: Configuring the scale of I/O Tags
Question: How can I configure the scale of I/O Tags to display values divided by 10? Solution: On the I/O Tag, enable the Scale column's checkbox. Then, set the value of the MinUE and MinI/O columns as 0. On the MaxI/O column, set the maximum value of the device (1000, for exam ...
- KB-33278: "???" characters shown on Display when trying to display the bits of an I/O TAG
Question: Why does a communication error occur and the "???" characters appear when trying to display an I/O Tag's bit on a Display? Solution: To access an I/O Tag's bit, you need to set the UseBitFields property to True. So, the communication error will not occur anymore and the characters wil ...
- KB-34290: Setting a scale in the I/O tag
Question: How can I set a scale in an I/O tag's value? Solution: To do so, enable Scale column by clicking the respective checkbox, and set the values for the scale on the EU Min, EU Max, Dev Min and Dev Max columns. The EU Min and EU Max values represent the configuration of the values that are ...
- KB-32904: IP switchover
Question: Can I retrieve the number of the active IP with a tag? How can I force a switchover from the main to the backup IP? Solution: Yes, this can be done with IOKit's IPSelect and IPSwitch tags. They can be inserted in the application via Tag Browser; alternatively, you can also create two ...
- KB-33199: DLL/Connection sharing for multiple drivers
Question: Can I share a DLL/connection between two or more I/O Drivers? Solution: Yes. If ShareServer property is set as TRUE, this driver will share its execution between the other drivers sharing the same string in DriverLocation property. This means that only the first configured driver will ...
- KB-33385: I/O not working when tags are incorrectly configured
Question: A certain driver has two types of tags: one that points to existing variables, and another one that does not. In this case, why is I/O not happening to either type? Solution: This is because driver's EnableReadGrouping property, which enhances I/O performance, is enabled (TRUE); to fix ...
