This timer-based flashing signal example uses output Y0 as the flashing lamp and outputs Y2 and Y3 as indicators for timers T0 and T1. An operator panel adjusts the flashing-time setting and displays the setting plus both timer values. The evidence does not identify the PLC model, programming software, timer time base, or project logic.
Signal and Timer Assignment
| Item | Assigned function |
|---|---|
| Y0 | Flashing signal lamp |
| Y2 | Indicator illuminated while timer T0 operates |
| Y3 | Indicator illuminated while timer T1 operates |
| Up arrow | Increase the flashing-time setting by 1 |
| Down arrow | Decrease the flashing-time setting by 1 |
Operator-Panel Display Mapping
The units digit displays the configured flashing time. The tens digit is disabled. The hundreds digit displays the T0 value, and the thousands digit displays the T1 value. This mapping allows an engineer to compare the setting with both timer states from one numeric display.
The source states that the actual cycle is “X2,” but it does not define whether X2 is a multiplication notation, an input address, or another project-specific expression. Confirm that meaning in the project before converting the displayed setting into elapsed time.
Configure and Test the Flashing Time
- Use the up arrow and verify that the displayed flashing-time setting increases by 1.
- Use the down arrow and verify that the setting decreases by 1.
- Observe Y0 and confirm that it flashes after the setting changes.
- Observe Y2 and Y3 while Y0 operates, then compare their states with the displayed T0 and T1 values.
Do not infer seconds or milliseconds from the displayed value. Determine the configured timer time base and resolve the “X2” notation before validating the physical flash period.
Verification Limits
A complete commissioning check requires the timer instructions, presets, reset conditions, output logic, and operator-panel tag mapping. None of those implementation details are provided. Verify that Y0, Y2, Y3, T0, and T1 are not reused elsewhere and confirm the minimum and maximum permitted setting values in the actual project.
FAQ
Which Mitsubishi PLC output controls the flashing lamp?
Y0 is assigned to the flashing signal lamp.
What do Y2 and Y3 indicate in the timer example?
Y2 indicates operation of timer T0, while Y3 indicates operation of timer T1.
How do I change the flashing time from the operator panel?
Press the up arrow to increase the setting by 1 or the down arrow to decrease it by 1. Confirm the timer time base and the meaning of “X2” before interpreting the setting as elapsed time.