Siemens 6ES72141HG400XB0 — CPU 1214C, DC/DC/RELAY, 14DI/10D

Key Specifications (6ES72141HG400XB0)

Overview

The Siemens 6ES72141HG400XB0 is a compact CPU in the S7-1200 family, combining 14 digital inputs and 10 relay outputs in a single unit. The DC/DC/RELAY designation indicates DC input logic, a DC-driven relay coil stage, and relay contact outputs — this output stage provides isolated switching suitable for AC or DC loads up to the relay contact rating. The unit ships in bulk packaging without an integral operator display, requiring Ethernet-based commissioning via TIA Portal or a separate HMI for operator interaction. Memory capacity is 100kB, which accommodates mid-scale machine logic programs typical for standalone control tasks. The fixed I/O count and non-expandable architecture position this controller for applications where channel count is fixed at design time and no signal modules will be added later.

Family Context

The 6ES7214x naming scheme encodes the CPU model and power variant. The "C" suffix denotes the compact form factor with integrated I/O. The fourth character (H) identifies the supply/input voltage (DC 24 V), and the fifth character (G) indicates the output stage variant (relay). The -XB0 suffix designates the firmware release and regional certification bundle. This controller belongs to the CPU 1214 class, which is the largest I/O count in the S7-1200 compact series; users requiring additional channels typically migrate to the CPU 1215 family, which adds two analog inputs and a larger memory map.

Similar Catalog Parts

The following in-catalog parts share parametric similarity with the seed. All require the reader's own qualification; no interchange approval is implied by this listing.

6ES72141BG400XB0

Shares the same relay output configuration and 100kB memory as the seed. The key difference is the supply voltage class — the BG variant uses AC/DC/RELAY (AC line input) rather than DC/DC/RELAY. If the plant distribution is 120/230 V AC, this part may simplify the power architecture; if DC distribution is mandated, the seed remains appropriate.

6ES72141AG400XB0

Shares the same 100kB memory, 14 digital inputs, and DIN Rail mounting as the seed. The output type differs: this part uses solid-state outputs instead of relays. Solid-state switching eliminates mechanical contact wear but imposes current and voltage constraints that differ from relay contact ratings — coordination with the load type (resistive, inductive, lamp) must be verified against the solid-state output specifications.

6ES72151AF400XB0

Moves to the CPU 1215 family with 150KB memory and digital (transistor) outputs rather than relays. The wider temperature range (0–55°C) and larger memory may suit expanded programs, but the fixed transistor outputs replace relay isolation, which affects load compatibility and wiring practice.

FAQ

What is the difference between the DC/DC/RELAY and DC/DC/DC output stages on S7-1200 CPUs?

The DC/DC/RELAY designation means the outputs drive relay coils — the relay contacts are the switching element available to the load. DC/DC/DC means transistor outputs where the semiconductor switch is the load interface. Relay outputs allow AC or DC load switching with galvanic isolation; transistor outputs switch DC loads only and at lower current ratings.

Can 6ES72141HG400XB0 be expanded with signal modules or communication boards?

No. The 6ES72141HG400XB0 is classified as non-expandable. If additional I/O or communication interfaces are required, the reader should consider the CPU 1215 family, which supports signal expansion modules.

What programming software is used for the 6ES72141HG400XB0?

The 6ES72141HG400XB0 is programmed with Siemens TIA Portal ( Totally Integrated Automation Portal). The unit communicates over its integrated Ethernet port.