Practical engineering tools
Plan, compare, check.
Useful calculations and evidence checks before a site visit. No account required; no inputs uploaded.
I/O capacity
Channel-count estimate for one signal type at a time. Additional spare allowance is a percentage of required signals, not installed capacity.
Target = ceiling(required × (1 + allowance / 100)). Module count = ceiling(target / channels).
This does not select hardware or check voltage, current, channel isolation, safety function, backplane capacity or power.
Calculated result
- Required channels
- 24
- Target including allowance
- 29
- Modules by channel count
- 2
- Installed channels
- 32
- Unused channels
- 8
Calculation and comparison aids only. Verify inputs against manufacturer records and project requirements. Inputs remain in this page and are lost when you leave unless exported. No connection to a PLC or production network is made.