Unexpected return value for ModuleStates (S7-1200)

Hello. I am dealing with an issue with the ModuleStates function. My program passes the value "1" to the parameter LADDR. This value "1" is set for the "Device Number" setting in the IO configuration. Nonetheless the ModuleStates function returns error code 16#8091 [Hardware identifier of the LADDR parameter does not exist. Check (for example, in the system constants) whether the value for LADDR exists in the project].
I have also tried the values shown in the system constants for this PROFINET IO device with same results. What is wrong with my use of this function, I wonder.

AlfredoQuintero said:

Hello. I am dealing with an issue with the ModuleStates function. My program passes the value "1" to the parameter LADDR. This value "1" is set for the "Device Number" setting in the IO configuration. Nonetheless the ModuleStates function returns error code 16#8091 [Hardware identifier of the LADDR parameter does not exist. Check (for example, in the system constants) whether the value for LADDR exists in the project].
I have also tried the values shown in the system constants for this PROFINET IO device with same results. What is wrong with my use of this function, I wonder.

Click to expand...

You don't want the device number, there. You want the HW ID, from the system constants tab. There's a bunch of them, I think you need the one for the Profinet Device.

Thanks very much mk42, for your advice. I have also tried the hardware identifier codes in the system constants tab. None seems to do the trick, as you can see from the below table.

For the previous screenshot I used DeviceStates instead of ModulesStates, but the return values are the same for both functions. To make it even more confusing, going back to ModulesStates function, if I use HW_IF 270 the return value is normal (0) and even the counter for disconnections for this HW_ID 270 works (logic in the second rung). However, I cannot find HW_ID anywhere referenced in this project. There are only two devices in this project, the S7-1200 and this one Profinet IO device I am trying to figure out how to detect when its communication with the Profinet controller fails.

Sorry, sorry, sorry, one thousand times over. One has to click on the device in network view to see the hardware ID. But if you double-click the device and get the property pages the hardware ID does not show up.