
PLC Direct is not an authorized distributor. We offer a broad range of in-stock products with minimal lead time.

PLC Direct is not an authorized distributor. We offer a broad range of in-stock products with minimal lead time.


PLC Direct is not an authorized distributor. We offer a broad range of in-stock products with minimal lead time.

6 inputs for thermocouples For sensor types J, K, N, S, B, R Additional direct raw value measurement Integrated terminal temperature compensation Configurable filter time The module is equipped with 6 inputs for J, K, N, S, B and R thermocouple sensors. The module has an integrated terminal temperature compensation.


Intel Atom 1.0 GHz processor with an additional I/O processor Onboard Ethernet, POWERLINK with poll response chaining and USB 3 slots for modular interface expansion CompactFlash as removable application memory 256 MB DDR2-SDRAM Controller redundancy possible Fanless The X20CP3585 controller is based on an Atom processor clocked at 1 GHz and equipped with 256 MB DDR2 SDRAM. USB, Ethernet, POWERLINK and removable CompactFlash are all included as standard features. A Gigabit Ethernet interface is a standard feature. For even more real-time network performance, the onboard POWERLINK interface supports poll response chaining mode (PRC). The controller is equipped with 3 slots available for X20 communication modules. Various bus and network systems can easily be integrated into the X20 system through the use of communication modules.

4 analog inputs Either current or voltage signal possible 16-bit digital converter resolution Simultaneous input conversion Very fast conversion time The module is equipped with 4 inputs with 16-bit digital converter resolution. It is possible to select between the current and voltage signal using different terminals.

| Product | |
| Article Number (Market Facing Number) | 6ES74070DA000AA0 | 6ES74070DA000AA0 |
| Product Description | SIMATIC S7-400, PS 407 POWER SUPPLY, 4A, 120/230V AC, 5V/4A DC |
| Product family | Not available |
| Product Lifecycle (PLM) | PM500:Discontinued Product or end of PLM & Support |
| Additional Product Information | |
| EAN | 4025515128427 |
| UPC | 662643197938 |
| Commodity Code | 85044090 |
| LKZ_FDB/ CatalogID | ST9-E5 |
| Product Group | 4463 |
| Group Code | R111 |
| Country of origin | Austria |
| SCIP number | Not available |
| Delivery information | |
| Net Weight (lb) | 2.291 lb |
| Package size unit of measure | Inch |
| Packaging Quantity | 1 |

| Product | |
| Article Number (Market Facing Number) | 6ES71517FA210AB0 | 6ES71517FA210AB0 |
| Product Description | *** spare part *** SIMATIC DP, IM151-7 F-CPU for ET200S, 192 KB work memory with integrated PROFIBUS DP interface (9-pole D-sub socket) as DP Slave, without battery SIMATIC MMC required |
| Product family | Not available |
| Product Lifecycle (PLM) | PM410:Product cancellation |
| Additional Product Information | |
| EAN | 4025515080381 |
| UPC | 040892914481 |
| Commodity Code | 85371091 |
| LKZ_FDB/ CatalogID | ST9.76 |
| Product Group | 4A9G |
| Group Code | R152 |
| Country of origin | Germany |
| SCIP number | Not available |
| Delivery information | |
| Net Weight (lb) | 0.571 lb |
| Package size unit of measure | Inch |
| Packaging Quantity | 1 |

The Siemens 6ES7331-1KF01-0AB0 is an SM 331 analog input module designed for SIMATIC S7-300 programmable logic controller systems. It provides 8 optically isolated analog input channels with 13-bit resolution for precise signal acquisition in industrial automation applications. The module supports versatile measurement types including voltage, current, resistance, and resistance temperature detectors. Compatible sensor types include PT100, NI100, NI1000, and LG-NI1000 RTDs with parameterizable characteristic linearization. Each channel can be independently configured for different signal ranges. The module operates with a 66 ms update time and features integrating measurement principle for noise suppression. Powered directly from the S7-300 backplane bus, it requires no external power supply for module electronics. The unit connects via a 40-pin front connector and is suitable for process monitoring, temperature measurement, and analog signal acquisition in manufacturing, building automation, and process control environments.
Item Details
- Brand Name: Siemens
- Manufacturer: Siemens
- Item Type Name: Analog Input Module
- Product Family / Series: SIMATIC S7-300
- Module Designation: SM 331
Product Specifications
- number_of_inputs: 8
- resolution: 13 bit with sign
- measurement_types: Voltage, Current, Resistance, RTD
- voltage_ranges: 0-10 V, ±10 V, 1-5 V, ±5 V, ±50 mV, ±500 mV, ±1 V
- current_ranges: 0-20 mA, 4-20 mA, ±20 mA
- resistance_ranges: 0-600 Ω, 0-6000 Ω
- rtd_types: PT100, NI100, NI1000, LG-NI1000 (standard/climatic)
- input_resistance_voltage: 100 kΩ (0-10 V, 1-5 V)
- input_resistance_resistance: 100 MΩ (600 Ω, 6000 Ω)
- voltage_accuracy: ±0.4% of range (±5 V, 10 V, 1-5 V, 0-10 V); ±0.3% (±50 mV, 500 mV, 1 V)
- current_accuracy: ±0.3% of range
- resistance_accuracy: ±0.3% of range
- rtd_accuracy: ±1 K (PT100, NI100 standard); ±0.8 K (PT100, NI100 climatic; NI1000, LG-NI1000)
- integration_time: 60/50 ms (parameterizable)
- conversion_time: 66/55 ms
- module_update_time: 66 ms
- isolation: Optical isolation
- power_supply: 5 V DC from backplane bus
- current_consumption: 90 mA max
- power_loss: 0.4 W typical
- permissible_input_voltage: 12 V DC continuous, 30 V DC max (1 s)
- permissible_input_current: 40 mA max
- max_cable_length_shielded: 200 m (50 m at 50 mV)
- common_mode_voltage: 2 V DC max
- connector_type: 1 x 40-pin
Measurements
- Weight: 0.2 kg

| Product | |
| Article Number (Market Facing Number) | 6ES78220AA060YA5 | 6ES78220AA060YA5 |
| Product Description | SIMATIC STEP 7 Basic V16; floating license; engineering software in the TIA Portal; software and documentation on DVD; license key on USB flash drive; class A; 6 languages: de,en,fr,es,it,zh; executable in Windows 7 (64-bit), Windows 10 (64-bit), Windows Server 2012R2 (64-bit), Windows Server 2016/2019 (64); for configuration of SIMATIC S7-1200 SIMATIC Basic Panels - - content: set (4x DVD + 1x USB) |
| Product family | Not available |
| Product Lifecycle (PLM) | PM490:Start of final year of support |
| Additional Product Information | |
| EAN | 4047622804421 |
| UPC | 804766971396 |
| Commodity Code | 85234910 |
| LKZ_FDB/ CatalogID | ST79-SW |
| Product Group | 4A6F |
| Group Code | R134 |
| Country of origin | Germany |
| SCIP number | Not available |
| Delivery information | |
| Net Weight (lb) | 0.485 lb |
| Package size unit of measure | Inch |
| Packaging Quantity | 1 |

| Product | |
| Article Number (Market Facing Number) | 6ES71934CD300AA0 | 6ES71934CD300AA0 |
| Product Description | *** Spare part *** SIMATIC DP, Terminal module TM-P15C23-A0 for ET 200S for power modules, 15 mm width, spring-type terminals (Cage Clamp) 2x3 terminal connections with terminal access to AUX1, AUX1 interrupted |
| Product family | Not available |
| Product Lifecycle (PLM) | PM410:Product cancellation |
| Additional Product Information | |
| EAN | 4025515059950 |
| UPC | 662643227468 |
| Commodity Code | 85389099 |
| LKZ_FDB/ CatalogID | ST76 |
| Product Group | 4467 |
| Group Code | R151 |
| Country of origin | Romania |
| SCIP number | Not available |
| Delivery information | |
| Net Weight (lb) | 0.139 lb |
| Package size unit of measure | Inch |
| Packaging Quantity | 1 |

| Product | |
| Article Number (Market Facing Number) | 6ES73141AG140AB0 | 6ES73141AG140AB0 |
| Product Description | SIMATIC S7-300, CPU 314 Central processing unit with MPI, Integr. power supply 24 V DC, work memory 128 KB, Micro Memory Card required |
| Product family | CPU 314 |
| Product Lifecycle (PLM) | PM400:Announcement of product phase-out |
| Additional Product Information | |
| EAN | 4025515077695 |
| UPC | 040892550290 |
| Commodity Code | 85371091 |
| LKZ_FDB/ CatalogID | ST73 |
| Product Group | 4302 |
| Group Code | R132 |
| Country of origin | Germany |
| SCIP number | Not available |
| Delivery information | |
| Net Weight (lb) | 0.694 lb |
| Package size unit of measure | Inch |
| Packaging Quantity | 1 |

| Product | |
| Article Number (Market Facing Number) | 6ES73217BH000AB0 |
| Product Description | SIMATIC S7-300, DIGITAL INPUT SM 321, OPTICALLY ISOLATED, 16 DI, DC 24V, 20 PIN, PROCESS INTERRUPT, DIAGNOSTICS |
| Product family | Not available |
| Product Lifecycle (PLM) | PM500:Discontinued Product or end of PLM & Support |
| Additional Product Information | |
| EAN | 4025515060857 |
| UPC | Not available |
| Commodity Code | Not available |
| LKZ_FDB/ CatalogID | ST9-E5 |
| Product Group | Not available |
| Group Code | R111 |
| Country of origin | Not available |
| SCIP number | Not available |
| Delivery information | |
| Net Weight (lb) | 0.520 lb |
| Package size unit of measure | Not available |
| Packaging Quantity | 1 |

| Product | |
| Article Number (Market Facing Number) | 6ES71421BD400XA0 | 6ES71421BD400XA0 |
| Product Description | ***Spare part*** SIMATIC DP, Extended module EM 142, ET 200X 4 DA DC 24V/2A, 5-pole M12,IP65 for all basic modules |
| Product family | Not available |
| Product Lifecycle (PLM) | PM500:Discontinued Product or end of PLM & Support |
| Additional Product Information | |
| EAN | 4025515058748 |
| UPC | 662643232264 |
| Commodity Code | 85389091 |
| LKZ_FDB/ CatalogID | ST9-E5 |
| Product Group | 4468 |
| Group Code | R111 |
| Country of origin | Germany |
| SCIP number | Not available |
| Delivery information | |
| Net Weight (lb) | 0.639 lb |
| Package size unit of measure | Inch |
| Packaging Quantity | 1 |

| Product | |
| Article Number (Market Facing Number) | 6ES72231PH000XA0 |
| Product Description | SIMATIC S7-200, DIGITAL I/O EM 223, FOR S7-21X CPU ONLY, 8 DI DC 24 V/ 8 DO RELAY FOR S7-21X CPU ONLY |
| Product family | Not available |
| Product Lifecycle (PLM) | PM500:Discontinued Product or end of PLM & Support |
| Additional Product Information | |
| EAN | 4025515160298 |
| UPC | Not available |
| Commodity Code | 85389091 |
| LKZ_FDB/ CatalogID | ST9-E5 |
| Product Group | 2283 |
| Group Code | R111 |
| Country of origin | United States of America |
| SCIP number | Not available |
| Delivery information | |
| Net Weight (lb) | 0.593 lb |
| Package size unit of measure | Inch |
| Packaging Quantity | 1 |

| Product | |
| Article Number (Market Facing Number) | 6ES79720CB200XA0 | 6ES79720CB200XA0 |
| Product Description | *** SPARE PART*** SIMATIC S7, PC ADAPTER USB F. CONNECTION OF S7-200/300/ 400, C7; WITH USB-CABLE (5M) CAN BE USED UNDER WINXP/VISTA/ WINDOWS 7 32/64BIT |
| Product family | Not available |
| Product Lifecycle (PLM) | PM500:Discontinued Product or end of PLM & Support |
| Additional Product Information | |
| EAN | 4019169101325 |
| UPC | 662643229493 |
| Commodity Code | 85176200 |
| LKZ_FDB/ CatalogID | ST9-E5 |
| Product Group | 4227 |
| Group Code | R111 |
| Country of origin | Germany |
| SCIP number | Not available |
| Delivery information | |
| Net Weight (lb) | 1.082 lb |
| Package size unit of measure | Inch |
| Packaging Quantity | 1 |
PLC modules are the expansion and signal processing hardware that extend a programmable logic controller's capabilities beyond the base CPU, covering digital and analog I/O, specialty functions, communication interfaces, and power supply modules installed in the controller rack or station. PLC Direct supplies PLC modules as an independent supplier, carrying surplus sealed, refurbished, and used hardware for maintenance and replacement across the major PLC platforms deployed in installed automation systems.
Where Are PLC Modules Used in Industrial Environments?
PLC modules are used wherever a base PLC controller requires additional I/O channels, signal types, or functional capabilities beyond what the CPU alone provides, from local rack expansion to distributed I/O stations across a facility. These components are present in virtually every modular PLC installation, handling field signal acquisition, output control, specialty measurement, and network communication alongside the controller CPU.
Facilities and operations that depend on PLC modules include:
-
Discrete manufacturing plants expanding PLC I/O capacity at machine control panels and distributed field cabinets across production lines.
-
Food and beverage processing facilities adding analog input and output modules for temperature, pressure, and flow measurement in batch and continuous process control.
-
Automotive assembly operations using specialty function modules for high-speed counter inputs, encoder feedback, and motion control coordination.
-
Water and wastewater treatment plants extending PLC I/O across pump station control panels and remote treatment process equipment.
-
Packaging and material handling operations where high channel-count digital I/O modules handle the sensor and actuator density of automated sorting and conveyor systems.
A failed or discontinued PLC module in a production system requires a like-for-like replacement to restore the channel capacity and signal type that the controller program depends on.
Which Brands of PLC Modules Does PLC Direct Stock?
PLC Direct stocks PLC modules across the major controller platforms deployed in installed automation systems worldwide.
-
Siemens SIMATIC S7-1200, S7-1500, and ET 200SP modules: Analog input modules across the SM1231 series, digital I/O modules for S7-1200 and S7-1500 racks, and ET 200SP distributed I/O modules including AI and DI/DQ types with PROFINET interface modules confirmed in stock.
-
Omron CJ Series I/O and special function modules: CJ1W digital input, digital output, and analog I/O modules alongside special function modules including high-speed counter units and expansion I/O control units for installed CJ Series PLC architectures.
-
Schneider Electric Modicon Quantum and M580 I/O modules: Discrete and analog expansion modules for the Modicon Quantum 140-series platform and Modicon M580 BMEP/BMEH series, covering the full range of field signal types used in installed Modicon process and machine control systems.
-
B&R X20 System I/O modules: Digital and analog I/O modules, power supply modules, and interface components within the X20 modular system, used in machine and line automation architectures with POWERLINK communication.
PLC Direct carries PLC modules as surplus sealed, refurbished, and used hardware, giving maintenance teams options across condition grades and budget requirements.
What Should You Know Before Ordering PLC Modules?
Hardware condition options: PLC Direct supplies PLC modules in surplus sealed, refurbished, and used condition. Surplus sealed units are factory-sealed stock that has not been previously installed; refurbished modules have been inspected and tested to confirm operational functionality; used hardware is sourced from decommissioned systems and suits facilities managing lifecycle replacements under budget constraints.
Compatibility and part identification: PLC modules are platform-specific and must be matched to the correct controller series, rack or backplane type, and in some cases, firmware version of the installed CPU. A Siemens S7-1200 signal module, for example, is not compatible with an S7-1500 rack, and ET 200SP peripheral modules require a matched interface module for the network protocol in use. Confirm the full module part number, controller series, and rack slot requirements from the installed system's documentation before ordering.
Warranty: All PLC module hardware purchased from PLC Direct carries a standard 1-year PLC Direct warranty covering defects and functionality, applicable to surplus sealed, refurbished, and used products.
PLC Direct supplies PLC module hardware for replacement and maintenance purposes and does not provide system design, programming, or integration services.






