DI
PLC digital input
A PLC digital input reads a documented discrete electrical state from field wiring.
Schematic
IEC · PLC
IEC two-wire PLC point: out, 1st point, 2 wires
Two-wire PLC point form: OUT, 1st Point, 2 Wires.
In plain English
What does IEC two-wire PLC point: out, 1st point, 2 wires mean?
A two-wire PLC point form shows two terminal connections associated with a controller input or output point. The symbol is an interface reference, and the module data must establish whether the connection is digital, analogue, isolated or part of a shared common group. This entry identifies the out, 1st point, 2 wires form in the publisher's IEC-context family.
A simple example
When tracing a field device to a PLC terminal strip, identify the rack, module, channel and both terminal numbers. Follow the common or return conductor as carefully as the signal conductor so a technician can reconcile the schematic with the module wiring sheet. The two-connection interface must be read with the load and supply arrangement. Leakage current and minimum load can matter where a powered device is connected in series with an input.
What the drawings help you do
Two drawn wires do not prove that the field device is loop-powered or that a point can supply current. Electrical type, polarity, common grouping and internal protection depend on the selected module and cannot be inferred from the outline.
This particular reference
Two-wire PLC point form: OUT, 1st Point, 2 Wires. This entry adds the out, 1st point, 2 wires detail to the broader two-wire PLC point family. Two drawn wires do not prove that the field device is loop-powered or that a point can supply current. Electrical type, polarity, common grouping and internal protection depend on the selected module and cannot be inferred from the outline.
- Terminal
- An identified point where a conductor connects.
- Signal
- Electrical information passed between devices, rather than necessarily the main power supply.
- Rating
- A value stating the conditions for which equipment is specified.
Read the source: PLC input and output point symbols
IEC · OUT, 1st Point, 2 Wires
Autodesk IEC-60617 Symbol Preview: PLC I/O, PLCIOO2T / PLCIOO2TV. This identifies the publisher's library context; exact IEC graphics and database identities are not asserted.
Shown as an independently authored educational illustration. Use the cited publication and drawing legend to verify the required drafting form.
Schematic · PLC
What it represents
A two-wire PLC point form shows two terminal connections associated with a controller input or output point. The symbol is an interface reference, and the module data must establish whether the connection is digital, analogue, isolated or part of a shared common group. This entry identifies the out, 1st point, 2 wires form in the publisher's IEC-context family.
When tracing a field device to a PLC terminal strip, identify the rack, module, channel and both terminal numbers. Follow the common or return conductor as carefully as the signal conductor so a technician can reconcile the schematic with the module wiring sheet. The two-connection interface must be read with the load and supply arrangement. Leakage current and minimum load can matter where a powered device is connected in series with an input.
Two drawn wires do not prove that the field device is loop-powered or that a point can supply current. Electrical type, polarity, common grouping and internal protection depend on the selected module and cannot be inferred from the outline.
How to read it
- The two-connection interface must be read with the load and supply arrangement. Leakage current and minimum load can matter where a powered device is connected in series with an input.
- Two drawn wires do not prove that the field device is loop-powered or that a point can supply current. Electrical type, polarity, common grouping and internal protection depend on the selected module and cannot be inferred from the outline.
Information to show or reference
- Identify controller, module and channel address.
- Label both terminals and the shared common where used.
- Reference signal type, polarity and module wiring documentation.
A distinction that matters
This entry adds the out, 1st point, 2 wires detail to the broader two-wire PLC point family. Two drawn wires do not prove that the field device is loop-powered or that a point can supply current. Electrical type, polarity, common grouping and internal protection depend on the selected module and cannot be inferred from the outline.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
PLC input and output point symbols
Public PLC I/O table explicitly lists PLCIOO2T / PLCIOO2TV with this operating or connection form. Vendor graphics are linked, not copied.
About this graphic
This illustration was authored independently by Elora Grid to explain the concept. It is not reproduced from a customer drawing, an official standard graphic or a manufacturer CAD file. Its correspondence to an exact IEC or IEEE symbol identifier has not been certified.
SVG and DXF downloads contain this original artwork. DXF uses unscaled drawing units; a GA envelope supplies no product dimensions, clearances or fabrication information. Original artwork is available under CC BY 4.0. Third-party references retain their own terms.
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