Topics

1

Support Questions / Message display by value in reverse

« on: November 22, 2015, 11:48:05 PM »

Hi Archie,
Is there a control or some technique to allow a PLC value to be updated according to a value from a list (maybe a dropdown list)?

What I am looking for is almost the exact inverse of the "message display by value" or ideally a way to add a feature to the "message display by value" so that, in addition to the existing functionality, the message list could be used to allow the user to select a message and set the PLC to the corresponding numeric value from the list.

Regards,
Ron

2

Support Questions / LinearMeterV target value scaling

« on: October 05, 2015, 08:45:57 PM »

Hi,
I have a LinearMeterV set to display 0-100.0% from a PLC value that is 0-1000 (value scale factor = 0.1). This works fine.
The target value from the PLC is scaled the same way, however the target value display isn't scaled when it is displayed. It doesn't seem to be influenced by the value scale factor.
Is there some way to scale the target value, either the same as the value or independently?

Regards,

Ron

3

Support Questions / Modbus TCP access to unimplemented functions

« on: September 30, 2015, 09:57:19 PM »

Hi,
I have an application that needs to read some of the Modbus function code 08 (diagnostics  - error counters etc) and also read the slave device identification - function code 43. I understand that these function codes are not supported in AdvancedHMI.

These are part of the Modbus standard, but not all that commonly used, so I understand why they are not implemented. I am certainly not suggesting they should be, just looking for a work around.

In order to access these less common functions and possibly others, is it possible to call some existing low level function (maybe the data link layer) with a string etc containing the Modbus query (ie the PDU) to be sent  and then receive the PDU from the reply as a raw un-parsed string into the text property of a control or another callback function etc?

Ron

4

Support Questions / Modbus TCP: Button to clear several coils at once

« on: September 29, 2015, 08:42:57 AM »

Hi,
I have an application using Modbus TCP to control a VSD that has separate "coils" for forward and reverse operation. To stop, I need to clear both "coils". Is there a way for a single button to write the same value (in this case reset) to more than one "coil" address?

Regards,
Ron