Siemens PLC Series & Modules for Sale in South Africa | Nkokhi Group

Siemens PLCs, SIMATIC CPUs, I/O Modules, Communication Modules & Automation Spares

Nkokhi Group supplies and sources Siemens PLCs and Siemens PLC modules in South Africa for industrial automation, mining, manufacturing, water treatment, power generation, process control, OEM machinery and infrastructure applications.

We can assist with sourcing new, refurbished, reconditioned and aftermarket Siemens PLC components, including CPUs, digital input/output modules, analogue modules, communication processors, power supplies, distributed I/O, interface modules and specialty modules.

Our sourcing network enables us to assist with both current Siemens PLC systems and hard-to-find or discontinued Siemens automation parts. Nkokhi Group already lists Siemens S7-1200, S7-1500, S7-300, S7-400 and ET 200 families among its PLC sourcing capabilities.

Siemens PLC Supplier South Africa

If you are searching for:

Siemens PLC for sale South Africa
Siemens PLC supplier South Africa
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Siemens SIMATIC PLC
Siemens S7 PLC
Siemens S7-1200 PLC
Siemens S7-1500 PLC
Siemens S7-300 PLC
Siemens S7-400 PLC
Siemens ET 200 modules
Siemens PLC CPU
Siemens PLC I/O modules
Siemens digital input modules
Siemens digital output modules
Siemens analogue input modules
Siemens analogue output modules
Siemens communication modules
Siemens PROFIBUS modules
Siemens PROFINET modules
Siemens PLC replacement parts
Siemens obsolete PLC modules
Siemens automation spare parts

Nkokhi Group can assist with sourcing the required component according to the exact Siemens part number, machine, PLC series and application.

Siemens’ current SIMATIC portfolio includes controllers, distributed I/O, engineering tools and other automation components, with S7-1200 G2 and S7-1500 among its current controller offerings.

Siemens SIMATIC PLC Series & Models

1. Siemens SIMATIC S7-1200 PLC

The Siemens S7-1200 is a compact PLC family used extensively for machine automation, pumps, conveyors, packaging, water treatment and smaller industrial control systems.

Siemens’ catalogue identifies S7-1200 as a basic controller family and includes CPUs, I/O modules, power supplies, operator interfaces and add-on products.

Common S7-1200 Models

CPU 1211C
CPU 1212C
CPU 1214C
CPU 1215C
CPU 1217C
S7-1200 SM Digital Input Modules
S7-1200 SM Digital Output Modules
S7-1200 SM Analogue Input Modules
S7-1200 SM Analogue Output Modules
Signal Boards
Communication Modules
Technology Modules

Important: Siemens has announced that first-generation S7-1200 modules are scheduled for phase-out from 1 November 2026, making accurate identification of existing installations particularly important when sourcing replacement modules.

2. Siemens SIMATIC S7-1500 PLC

The Siemens S7-1500 is a high-performance modular PLC platform used for demanding machine and plant automation.

The S7-1500 architecture includes CPUs, signal modules, technology modules, communication modules, power supplies and central/distributed configurations.

Siemens S7-1500 Components

S7-1500 CPU modules
Standard CPUs
Compact CPUs
Technology CPUs
Fail-safe CPUs
Redundant CPUs
Digital Input modules
Digital Output modules
Analogue Input modules
Analogue Output modules
Technology modules
Communication modules
Interface modules
Power supply modules
ET 200SP distributed I/O
ET 200MP modules

Popular S7-1500 Applications

Mining automation
Conveyor systems
Water treatment
RO plants
Manufacturing
Process control
Packaging machinery
Pump stations
Power systems
Material handling
Industrial production lines

3. Siemens SIMATIC S7-300 PLC

The Siemens S7-300 is a modular PLC platform widely encountered in established industrial installations.

Common S7-300 CPUs

CPU 312
CPU 313
CPU 314
CPU 315
CPU 316
CPU 317
CPU 318

S7-300 Modules

SM321 Digital Input
SM322 Digital Output
SM331 Analogue Input
SM332 Analogue Output
CP Communication Processors
IM Interface Modules
PS Power Supply Modules
Special Function Modules
Technology Modules

For older plants where replacing the entire control system is not practical, sourcing a replacement S7-300 CPU or I/O module can help maintain existing equipment.

4. Siemens SIMATIC S7-400 PLC

The S7-400 is a modular PLC family associated with larger and more complex automation and process-control installations.

Siemens’ South African Industry Mall categorises S7-400 alongside S7-400H and S7-400F/FH advanced controllers.

S7-400 Components

S7-400 CPUs
CPU modules
Digital Input modules
Digital Output modules
Analogue Input modules
Analogue Output modules
Communication processors
Interface modules
Power supplies
Rack components
Function modules
Redundancy components

Nkokhi Group can assist with sourcing S7-400 replacement and hard-to-find modules according to the exact part number.

5. Siemens SIMATIC ET 200 Distributed I/O

Siemens ET 200 systems provide distributed I/O for industrial automation applications.

ET 200 Families

ET 200SP
ET 200MP
ET 200S
ET 200M
ET 200AL
ET 200PRO
ET 200SP HA
ET 200ECO

Siemens’ portfolio includes multiple ET 200 distributed I/O families for central and distributed automation architectures.

ET 200 Components

Digital Input Modules
Digital Output Modules
Analogue Input Modules
Analogue Output Modules
Interface Modules
Communication Modules
Bus Adapters
Base Units
Terminal Modules
Power Modules
Technology Modules

6. Siemens LOGO! Logic Modules

Nkokhi Group can also source Siemens LOGO! programmable logic modules and associated expansion components.

LOGO! Components

LOGO! CPU / Logic Modules
Digital I/O expansion
Analogue I/O
Communication modules
Ethernet modules
Power supplies
Expansion modules
Accessories

Siemens’ Industry Mall categorises LOGO! separately from the S7 basic and advanced controller families.

Siemens PLC Modules We Supply & Source

Siemens PLC CPU Modules

S7-1200 CPU
S7-1500 CPU
S7-300 CPU
S7-400 CPU
LOGO! controllers
Fail-safe CPUs
Technology CPUs
Redundant CPUs

Digital Input Modules

Digital input modules interface the PLC with field devices such as:

Proximity sensors
Limit switches
Pressure switches
Level switches
Push buttons
Contactors
Machine interlocks

Digital Output Modules

Used to control:

Solenoid valves
Contactors
Relays
Motors
Actuators
Indicator lights
Pumps
Fans

Analogue Input Modules

For signals such as:

4–20 mA
0–10 V
Pressure
Temperature
Level
Flow
Speed
Process instrumentation

Analogue Output Modules

Used for controlling:

Variable-speed drives
Control valves
Actuators
Process controllers
Dosing systems

Communication Modules

Nkokhi Group can source Siemens communication modules for systems using:

PROFINET
PROFIBUS
Industrial Ethernet
Modbus
Serial communication
Remote I/O
Industrial networking
PLC-to-PLC communication

Siemens PLC Communication & Networking

Modern industrial automation systems depend heavily on reliable communication between PLCs, HMIs, drives, remote I/O and SCADA systems.

We can assist with sourcing:

This is particularly relevant for mining, water treatment, manufacturing and process-control systems where PLCs need to communicate with distributed field equipment.

Siemens PLCs for Mining

Nkokhi Group supplies and sources Siemens automation components for mining applications, including:

Crushers
Conveyors
Screens
Pumps
Dewatering systems
Crushers and feeders
Processing plants
Material handling
Ventilation systems
Control panels
Plant monitoring
SCADA systems

We can assist with replacement PLC CPUs, I/O modules, communication modules and other automation spares.

Siemens PLCs for Water & Wastewater

Siemens PLC systems are widely applicable to automated water and wastewater processes.

Nkokhi Group can source PLC components for:

Water treatment plants
RO plants
Pump stations
Sewage treatment
Filtration
Chemical dosing
Pressure control
Level control
Flow control
Reservoir automation
SCADA systems

Siemens PLCs for Manufacturing

Applications include:

Production lines
Packaging
Assembly systems
Conveyors
Material handling
Machine automation
Robotics
Process control
Factory automation
OEM machinery

Other Siemens Automation Products

In addition to PLCs and modules, Nkokhi Group can assist with sourcing other Siemens industrial automation products, including:

Siemens HMI

SIMATIC HMI
Basic Panels
Comfort Panels
Unified Comfort Panels
HMI accessories

Siemens Drives

SINAMICS G120
SINAMICS G120X
SINAMICS drives
Drive communication components

Siemens Power Supplies

SITOP power supplies
Industrial DC power supplies
Automation power components

Siemens’ South African Industry Mall includes SIMATIC automation, HMI, industrial communication and SITOP power supply product categories.

Siemens PLC Manufacturers & Compatible Automation Brands

Nkokhi Group specialises in sourcing industrial automation equipment from major international manufacturers.

Siemens

SIMATIC
S7-1200
S7-1500
S7-300
S7-400
ET 200
LOGO!
SIMATIC HMI
SINAMICS
SITOP

Other Automation Manufacturers

We can also assist with automation components from:

Siemens
Rockwell Automation / Allen-Bradley
Schneider Electric
ABB
Mitsubishi Electric
Omron
Beckhoff
Yokogawa
Honeywell
GE
Emerson

Nkokhi Group’s industrial automation portfolio includes Siemens, Schneider Electric, Rockwell Automation, ABB, Mitsubishi and Omron platforms.

New, Refurbished & Obsolete Siemens PLC Modules

Depending on availability and application requirements, Nkokhi Group can source:

New Siemens PLC Modules

Suitable where customers require new equipment for installations, upgrades or replacement.

Refurbished Siemens PLC Modules

A potential option for maintaining older systems where new replacement modules are expensive or discontinued.

Reconditioned PLC Modules

Available depending on the specific part number and supplier availability.

Obsolete Siemens PLC Modules

We assist with sourcing discontinued and hard-to-find Siemens components through specialist and international supply channels.

Availability, condition, testing status and warranty should always be confirmed for each specific module before ordering.

Tips for Buying Siemens PLC Modules

1. Always provide the complete part number

Siemens part numbers can contain multiple characters and variations. For example, 6ES7-series part numbers should be checked carefully before ordering.

2. Send a photograph of the module

A clear photograph of the module label can help identify:

Manufacturer
Product family
Part number
Hardware version
Firmware information
Serial information

3. Check PLC compatibility

A module must be compatible with the specific:

CPU
PLC family
Firmware
Rack/system configuration
Communication architecture
I/O configuration

4. Check whether the PLC is obsolete

Before purchasing an older replacement, establish whether the series is still supported and available.

This is particularly important for legacy S7 systems and first-generation S7-1200 components.

5. Consider keeping critical spares

For production-critical systems, maintaining spare:

CPU
DI module
DO module
Analogue module
Communication module
Power supply

can reduce potential plant downtime.

6. Confirm the exact electrical specification

Check:

Supply voltage
Input voltage
Output type
Number of channels
Current rating
Analogue signal type
Communication protocol

7. Confirm new vs refurbished

If a replacement module is being sourced, clearly specify whether you require:

How to Order Siemens PLC Modules from Nkokhi Group

Send us the following information:

Manufacturer: Siemens
PLC Series: S7-1200 / S7-1500 / S7-300 / S7-400 / ET 200 / LOGO!
Part Number: 6ES7-XXXXXXXX
Description: PLC CPU / DI / DO / AI / AO / Communication
Quantity: X units
Condition: New / Refurbished / Either
Application: Mining / Water / Manufacturing / Other

We will check availability and sourcing options.

Why Buy Siemens PLC Modules from Nkokhi Group?

South African industrial automation supplier
Nationwide sourcing capability
Siemens PLC and SIMATIC expertise
New and refurbished sourcing options
Obsolete and hard-to-find PLC sourcing
International supplier network
Industrial automation spare parts
Mining automation support
Water and wastewater automation
Manufacturing automation
PLC and SCADA components
Competitive sourcing
Quote-based supply

Frequently Asked Questions

What Siemens PLCs does Nkokhi Group supply?

We source Siemens SIMATIC PLCs and modules including S7-1200, S7-1500, S7-300, S7-400, ET 200 and LOGO!, subject to availability.

Do you supply Siemens S7-1200 PLCs?

Yes. We can source S7-1200 CPUs, signal modules, communication modules, expansion modules and related components.

Do you supply Siemens S7-1500 PLCs?

Yes. We can source S7-1500 CPUs, I/O modules, communication modules, technology modules, interface modules and power supplies.

Can you supply old Siemens S7-300 modules?

Yes. We can assist with sourcing S7-300 replacement and hard-to-find modules.

Can you supply S7-400 PLC modules?

Yes. S7-400 CPUs, I/O modules, communication processors, interface modules and other components can be sourced according to availability.

Do you supply ET 200 modules?

Yes. We can source ET 200SP, ET 200MP and other ET 200 distributed I/O components.

Can you supply obsolete Siemens PLC modules?

Yes. Nkokhi Group specialises in sourcing hard-to-find, obsolete and discontinued industrial automation components.

Do you supply refurbished Siemens PLCs?

Yes. Refurbished and reconditioned options may be available depending on the required part number.

How do I identify the correct Siemens PLC module?

Send us a clear photograph of the module label together with the complete Siemens 6ES7 part number. We can use this information to identify the required component.

Can you source Siemens PLC modules from overseas?

Yes. Nkokhi Group can source industrial automation components through international supplier networks when local stock is unavailable.

Do you supply PLC modules for mining?

Yes. We source Siemens PLC and automation components for mining, conveyors, crushers, pumps, processing plants and other industrial applications.

Can you supply Siemens PLC components for water treatment?

Yes. We can source PLC CPUs, I/O, communication modules and associated automation components for water treatment, RO, wastewater and pump-control systems.

Can you supply Siemens PLC communication modules?

Yes. We can source communication components for PROFINET, PROFIBUS, Industrial Ethernet and other supported industrial networks, subject to the specific PLC platform.

Request a Siemens PLC Quote

Looking for Siemens PLC modules in South Africa?

Send Nkokhi Group your Siemens part number, description and quantity and we can check sourcing options.

Nkokhi Group (Pty) Ltd
South Africa
Siemens PLCs | SIMATIC PLCs | PLC Modules | Industrial Automation | SCADA Components

Request a quotation for Siemens PLCs and modules today.

Siemens PLC & Modules for Sale South Africa