A LOGO! analog switch can appear to accept a calculated threshold in simulation while the hardware parameter table continues to show zero. The available evidence separates two issues: the displayed parameter table is not the authoritative live-value view on the device, and the reported hardware runs the first LOGO! 8.2 firmware release.
Interpret the Online Values Correctly
In simulation mode, values under the blocks update in the parameter table. On the physical device, inspect the actual analog-block values by placing the cursor on the block and selecting the glasses icon shown at the right. A correct value at B140 in this live view, combined with zero at B051 Aq in the parameter list, does not by itself prove that B140 failed to calculate.
| Observation | Interpretation |
|---|---|
| B140 shows the expected online value | The arithmetic result exists at B140. |
| B051 Aq remains zero in the parameter list | Verify the live value through the block's glasses icon before diagnosing a transfer failure. |
| Simulation updates the parameter table | Do not assume the physical device presents live values in the same location. |
Validate the Threshold Calculation and Link
The stated requirement is ambiguous: ON is to increase by 5%, while “OFF in 10%” could describe a different increase or a final setting. Define that requirement before testing the link. If the intended changes are proportional increases, the symbolic calculations are:
Confirm that the arithmetic instruction receives its parameter from the analog amplifier and that its output is connected to the intended B051 parameter. VW64 and VW66 are reported as the exported ON and OFF values modified through the web-server page; compare those words with the arithmetic output and B051's live block values rather than relying only on the parameter-list Aq display.
Check Firmware in the Required Sequence
The reported firmware is V1.82.01, identified in the evidence as the first LOGO! 8.2 firmware version. Later versions cited are V1.82.02 and V1.82.04, but the evidence does not establish that firmware causes this parameter-display behavior.
- Verify B140, B051, VW64, and VW66 online using the live block-value view.
- If updating the reported V1.82.01 device, update first to V1.82.02 and then to V1.82.04; do not skip the stated intermediate version.
- Repeat the same threshold change on the hardware and compare the live B140 result, the live B051 value, and VW64/VW66.
Verification Criteria
Accept the calculation when B140 shows the intended result and B051's live block value follows it after the source threshold or web-server value changes. If B140 changes but B051's live value does not, inspect the parameter link. If only the parameter-list Aq remains zero while the live value responds, treat the discrepancy as a monitoring-view issue rather than proof of failed arithmetic.
FAQ
Why does the LOGO! parameter table update in simulation but not online?
The block parameter table updates in simulation mode. On hardware, place the cursor on the block and select the glasses icon to inspect its actual values.
Does B051 Aq showing zero mean B140 did not transfer its value?
No. First confirm B140 and B051 through their live block-value views; the reported B140 result can be correct even while the parameter-list Aq shows zero.
How do I update LOGO! firmware V1.82.01 to V1.82.04?
Use the stated sequence: update V1.82.01 to V1.82.02 first, then update to V1.82.04. Retest the live B140 and B051 values after the update.