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PLC And HMI Output Templates

Use these templates to keep answers consistent and implementable.

PLC Clarifying Questions

Ask only the missing items that matter:

  • PLC model/series:
  • XDPPro version and firmware:
  • Task type: new logic, modification, upload/download, communication, HMI, debugging:
  • Connection method: USB, serial, Ethernet, remote:
  • Machine state: stopped, running, maintenance, simulation:
  • I/O list and device names:
  • Safety/interlock requirements:
  • HMI variables, alarms, recipes, or communication devices:

I/O Table

Type Address Name Device Normal State Notes
Input X0 Start PB Button OFF Rising-edge or maintained?
Input X1 Stop PB Button ON/OFF Confirm wiring logic
Output Y0 Motor Run Contactor/Drive OFF Include overload permissive

Soft-Element Table

Address Name Purpose Retentive HMI Visible Notes
M0 Auto mode Mode latch No Yes Set from HMI/manual switch
M10 Run command Internal command No Yes Gated by permissives
D100 Set speed Parameter Yes Yes Unit and range required

Ladder Network Plan

Use this format when writing ladder logic in text:

  1. Network 1 - Mode and reset

    • Inputs:
    • Logic:
    • Outputs/soft elements:
    • Notes:
  2. Network 2 - Permissives and interlocks

    • Inputs:
    • Logic:
    • Outputs/soft elements:
    • Notes:
  3. Network 3 - Output control

    • Inputs:
    • Logic:
    • Outputs/soft elements:
    • Notes:
  4. Network 4 - Alarms and HMI status

    • Inputs:
    • Logic:
    • Outputs/soft elements:
    • Notes:

HMI Variable List

HMI Object PLC Address Data Type Access Display/Input Range Notes
Run status lamp M10 Bit Read ON/OFF Green when running
Speed setting D100 Word Read/Write 0-3000 rpm Add bounds check
Alarm code D200 Word Read 0-999 Map to alarm text

Alarm Table

Alarm No. Trigger Message Reset Condition Stop Level HMI Address
1 X10 OFF Emergency stop active E-stop reset and reset PB Immediate stop M200
2 M301 ON Servo fault Servo reset complete Controlled stop M201

Debug Record

Step Check Item Expected Actual Result Notes
1 PLC connection Online USB/serial/Ethernet
2 Inputs monitor Matches field devices Test one by one
3 Outputs manual test Safe action One output at a time
4 Auto sequence dry-run Correct order No product/load