LOGO! in the Panel: Layout, Wiring and Documentation Done Right
A LOGO! module earns its place in a distribution panel the same way any other component does: through disciplined layout, separated wiring and paperwork that matches the cabinet, not just a spec sheet. Here is the practice that separates a panel with LOGO! on board from a control box wired at the bench.
Panel-Builder Practice: From DIN Layout to Documented I/O
DIN rail placement & spacing
The LOGO! base module and any expansion modules are positioned on the DIN rail with clearance for heat, wiring access and future add-ons — not squeezed in wherever there's room.
Control-voltage separation
LOGO!'s control supply is run and fused separately from power circuits in the same enclosure, so a fault on one side never takes down the other.
Terminal planning for field wiring
Every input and output is brought out to a numbered terminal row, not spliced at the module. Field cables land on terminals, not on the LOGO! itself.
Labelling & I/O documentation
Each terminal and I/O point carries a label that matches the wiring diagram and the I/O list — the cabinet and the paperwork tell the same story.
What Separates a Panel From a Prototype
Tested before it ships
Every panel is function-tested against its wiring diagram before it leaves the shop floor — the discipline behind the IEC 61439 series applied to a LOGO! panel, without us inventing test clauses that aren't part of your spec.
DIN rail discipline
Module placement and spacing planned up front, not improvised once the enclosure fills up.
Control-voltage separation
LOGO!'s supply kept independent of power circuits, with its own protection.
Terminal rows for field wiring
Dedicated terminals for every I/O point, sized and numbered for the installer on site.
Labelled, documented I/O
Labels on the cabinet match the I/O list on paper — no guessing which terminal is which six months later.
Wiring diagram + program file
Both delivered as standard, so the panel can be serviced or extended without reverse-engineering it first.
What Comes With a LOGO! Panel Build
Components sized to your point count, documentation that matches the cabinet.
- LOGO! base module and the expansion modules your I/O count requires
- DIN rail, terminal blocks and control-voltage protection sized for the panel
- Enclosure with spare terminal and mounting capacity, planned per IEC 61439 practice
- Wiring diagram and I/O list matching the physical labelling
- LOGO! Soft Comfort program file, function-tested against the diagram before dispatch
Frequently asked questions
What exactly is a LOGO! module?
It's a compact logic module — a micro-PLC for DIN rail — that sits between simple relay logic and a full-size PLC. It suits panels with a defined, contained control task rather than a building-wide point count.
How is LOGO! programmed?
With function block diagrams (FBD) in Siemens' LOGO! Soft Comfort software, which includes built-in simulation so the logic can be checked before it's loaded onto the module.
What I/O does the base module support, and can it be expanded?
The base module carries digital inputs and outputs; additional expansion modules add more I/O, and analog signals are supported where the task calls for them. Exact point counts depend on the module variant you choose.
Does LOGO! support networking?
The current LOGO! 8 generation supports Ethernet and Modbus TCP and includes a built-in web server, which covers most single-panel monitoring and integration needs.
When should we use KNX instead of LOGO!?
LOGO! is a good fit for a contained task — lighting on time or sensors, pump control, irrigation, ventilation, gate control, heating logic. Once a project needs many distributed points working together across a building, KNX is the better-suited system.
Planning a Panel With LOGO! Inside?
Send us the point count and the task, and our engineers will help you plan the layout, terminals and documentation before you order components.