Siemens SIMATIC S7-1200 CPU 1212C DC DC Relay PLC 6ES7212-1HE40-0XB0

Siemens SIMATIC S7-1200 CPU 1212C DC DC Relay PLC 6ES7212-1HE40-0XB0

6ES7212-1HE40-0XB0 identifies the Siemens SIMATIC S7-1200 CPU 1212C compact PLC in the DC/DC/relay configuration. It combines a 24 V DC controller supply, 24 V DC digital inputs and mechanical relay outputs in one compact unit. The controller includes eight digital inputs, six relay outputs and two analog voltage inputs. It belongs to the conventional S7-1200 generation. The complete ordering number is essential when selecting a replacement, since similarly named CPU 1212C products can have different supply arrangements, output technologies and generation-specific expansion hardware.

Built-in Inputs and Outputs

Eight onboard digital inputs accept 24 V DC signals with sinking/sourcing input wiring. Six onboard mechanical relay outputs switch externally supplied loads from 5–30 V DC or 5–250 V AC, with a maximum current of 2 A per channel. Relay contacts do not provide the load supply. Observe the documented load, group and temperature conditions and provide suitable protection and suppression for inductive loads. Two onboard analog inputs measure 0–10 V DC signals. There are no onboard analog outputs; that function requires a compatible optional signal board or signal module. Additional module channels must be counted separately from the CPU channels.

Communication and Programming

One integrated RJ45 Ethernet/PROFINET port provides the engineering and network connection. The physical connector and the configured communication service are separate specifications. PROFINET and SIMATIC communication require appropriate network configuration; serial communication requires a compatible optional CB or CM. Engineering uses SIMATIC STEP 7 in TIA Portal, with LAD, FBD and SCL programming. Current Siemens catalog data lists firmware V4.7 with STEP 7 V20 or higher. Check the firmware installed on a particular unit before choosing software. Software licenses, Ethernet cables and optional communication hardware are separate purchases unless explicitly included by the supplier.

Memory and Technology Functions

Current Siemens product information lists 100 KB of integrated program/data work memory. Do not add load memory or removable memory-card capacity to this figure. Earlier documentation can describe a different firmware-era capacity; verify an existing controller before planning a memory-sensitive replacement. Up to six high-speed counter functions can be configured, subject to input assignment and counting mode. Maximum documented counting frequency is 100 kHz; quadrature operation and individual terminals can have lower limits. The onboard mechanical relays are unsuitable for high-speed pulse trains. Pulse-output and pulse/direction motion functions require a compatible optional transistor-output signal board, suitable external drives and correct technology-object configuration. Pulse generators, physical output terminals and independently supported motion axes are different quantities.

Expansion Capability

CPU 1212C supports up to two local signal modules, up to three communication modules and one shared position for an SB, CB or BB. These limits remain subject to power budget and compatible hardware. Using two SM 1223 modules with 16 DI and 16 DO each gives 40 digital inputs and 38 digital outputs including the CPU. Adding a four-input SB 1221 gives a local maximum of 44 digital inputs. Alternatively, a four-output SB 1222 gives a local maximum of 42 digital outputs. These are separate maximum configurations and cannot be achieved simultaneously because the boards occupy the same position. A two-input/two-output SB 1223 instead permits 42 DI and 40 DO together. These calculated physical totals exclude analog channels and remote I/O.

Installation and Typical Applications

The controller requires 24 V DC nominal, with a permissible range of 20.4–28.8 V DC. Keep this controller supply distinct from the 24 V DC digital input signals and externally supplied relay load circuits. Size associated DC supplies for sensors, expansion hardware and loads using their respective requirements. The enclosure rating is IP20, and installation requires a suitable control cabinet. The CPU measures 90 × 100 × 75 mm and supports DIN-rail or direct panel mounting. Allow additional space for wiring, ventilation and expansion modules. Technically suitable applications include machine sequencing, conveyor sensor monitoring, production counting and analog transmitter monitoring. Motors and other substantial loads require suitable external switching or drive equipment; observe relay load and switching-duty limits.

Exact Variant and Documentation

Use documentation for the exact DC/DC/relay article when checking replacement wiring and compatibility. AC-powered variants, transistor-output variants and S7-1200 G2 products must not be treated as interchangeable. Verify the installed firmware, terminal assignments and optional module articles before commissioning. Standard PLC logic does not establish a safety-rated control function. The specified 12 Months warranty is the requested seller policy, not a verification of Siemens warranty terms.

Official Manufacturer Links

Official Manufacturer Product Page: https://sieportal.siemens.com/en-ww/products-services/detail/6ES7212-1HE40-0XB0?SiepCountryCode=WW

Official Manufacturer Datasheet / Technical Documentation: https://support.industry.siemens.com/teddatasheet/?caller=SIOS&format=pdf&language=en&mlfbs=6ES7212-1HE40-0XB0

Siemens SIMATIC S7-1200 CPU’s

• Siemens SIMATIC S7-1200 CPU