This error occurs when using a V8 compatible setting (*) on a V10/V9 series unit.

At the start of communication, the V10/V9 series initially displays the screen corresponding to the value specified for "n+2" in [Read Area].
"Screen No. Error" is displayed when the screen number entered for "n+2" in [Read Area] does not exist in the screen program.

* Procedure for checking V8 compatible settings:
- [Read/Write Area] is displayed at [System Setting] → [Hardware Setting] in V-SFT.

Solution 1

Check the value of "n+2" in [Read Area] and change it to the value of an existing screen number.
If the device memory of [Read Area] is unknown, check the following locations.
The screen number value can be checked in V-SFT and in Local mode on the V10/V9 series unit.

Locations to check

Checking in V-SFT

- [System Setting] → [Hardware Setting] → [Read/Write Area] → [Read Area] in V-SFT
   

Example) In the above screenshot, since the value of "n+2" in [Read Area] is "D00002", check the value of "D00002" on the PLC and change it to the value of an existing screen number if necessary.

* If the [GD-80 Compatible Read/Write Area] checkbox is selected in the [GD-80 Compatible] tab window, check the lower 8 bits of the device memory for "n+1" in [Read Area].

Checking in Local mode on the V10/V9 series unit

- Local mode → [System Information] → [Screen Data Information]
  Screen Command Memory (= "n+2" in [Read Area])
  

 * For more information on how to change to Local mode, click here.

If "Screen No. Error" is displayed when the emulator starts

Double-click the value of "n+2" in [Read Area] displayed in the [System] window of the simulator and change it to the value of an existing screen number.
Next, press the [Retry] switch on the emulator.

Solution 2

Set the initial screen.

* For V9, available with V-SFT Ver. 6.1.1.0 or later and V9 program Ver. 2.300 or later.

Setting location

[System Setting] → [Hardware Setting] → [Read/Write Area] → [Read Area] in V-SFT
Select the [Initial Screen] checkbox and set the initial screen number.