16 in stock
Schneider C921 Communications Processor
Schneider C921 Communications Processor
Brand/Manufacturer: Schneider Electric
Order Number: C921
Type: Communications Processors
Country of Origin: France
Condition: Original Brand
Lead Time: Available in stock
Payment Term: 100% TT In Advance
-
In-stock & ready for fast delivery. Shipping policy.
-
We’re here for you 24/7 ,Contact Us.
-
Only genuine, factory-sealed products，Learn More.
-
Refund Supported Within 30 Days, help.
-
All purchases include a 1-year warranty, help.
Trusted Global Payment Methods
Description
The Schneider C921 communications processor, also cataloged as the C921 communications module, operates as a dedicated hardware component for serial data communication tasks within Modicon PLC systems.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | C921 |
| Brand | Schneider Electric |
| Origin | France |
| Weight | 0.22 kg |
| Dimensions | 25 mm x 176 mm x 160 mm |
| Operating Temp | 0 deg C to 60 deg C |
| Power Consumption | 250 mA (at 5 VDC) |
| Communication Modes | Modbus RTU, Character-oriented |
| Network Role | Master or Slave (Selectable) |
| Interface Type | 9-pin D-sub male (RS-232/RS-485) |
| Dual-Port RAM | 4 KB |
| Configuration Memory | 8 KB EEPROM |
| Baud Rates | 300 to 19200 bit/s |
Profinet / EtherNet/IP Deterministic Networks and Serial Integration
The C921 module integrates deterministic communication protocols into the broader industrial control framework. While modern systems often rely on Profinet and EtherNet/IP deterministic networks, legacy field devices frequently require robust serial architectures. The dual-port RAM configuration (4 KB) enables seamless data exchange between the module's dedicated microcontroller and the main PLC CPU without bus contention. Furthermore, the on-board EEPROM guarantees parameter retention across power cycles without requiring internal backup batteries.
Frequently Asked Questions
Q: Does the C921 module support hot-swapping in a live rack?
A: No. Power must be removed from the rack before inserting or removing the C921 communications processor to prevent backplane bus damage.
Q: How is the module powered within the Modicon rack?
A: The unit draws its operating power (250 mA at 5 VDC) directly from the PLC backplane bus and requires no external power supply.
Q: Can both 9-pin D-sub ports be used simultaneously for network communication?
A: One port is designated for network access (RS-232/RS-485), while the second port is dedicated to programming and configuration connections.
Field Installation Guidelines
- Backplane Insertion: Align the printed circuit board with the designated slot on the Modicon PLC backplane and push gently until the module seats firmly.
- DIP Switch Configuration: Set the onboard banks of DIP switches to match the desired baud rate (300 to 19200 bit/s) and network node address before applying power.
- Shielding and Grounding: Connect the RS-485 or RS-232 cable shield to the designated ground lug on the chassis to minimize electromagnetic interference and maintain signal integrity.
Have a Question?
-
Focus on Benefits:
We focus on what truly matters to industrial buyers — authentic products, reliable stock, and fast global delivery. Explore how we support your operations with trusted sourcing and expert service.
-
Why You Can Trust Us:
We go beyond parts — delivering reliability, speed, and expertise trusted by industrial buyers worldwide.
-
Trusted by Global Clients
Serving thousands of companies across oil & gas, power, manufacturing, and more — from Fortune 500 enterprises to local distributors.
-
Uptime Is Our Priority
Downtime is costly. That’s why we ensure rapid access to critical parts, minimizing production interruptions and delays.
-
Experts in Sourcing Rare Parts
Our team specializes in finding hard-to-source and obsolete components — saving you time, risk, and procurement headaches.
-
One-Stop Automation Supply
We offer complete automation part solutions — PLCs, drives, sensors, HMIs, relays — with expert guidance every step of the way.
Testimonials
Fast Delivery, Excellent Quality
We’ve worked with IndustriaX Limited on several urgent orders for automation components. Their ability to provide original, factory-sealed parts with full documentation—often from in-stock inventory—has significantly reduced our downtime. The delivery is consistently fast, and their logistics team is highly responsive. IndustriaX has become one of our most trusted global suppliers for industrial spare parts.
- Sarah Johnson
We’ve worked with IndustriaX Limited on several urgent orders for automation components. Their ability to provide original, factory-sealed parts with full documentation—often from in-stock inventory—has significantly reduced our downtime. The delivery is consistently fast, and their logistics team is highly responsive. IndustriaX has become one of our most trusted global suppliers for industrial spare parts.
- Sarah Johnson
Reliable Partner for Original Parts
Finding authentic automation parts has always been a challenge, especially for discontinued models. IndustriaX Limited has impressed us with their genuine stock, clear product traceability, and prompt updates. We’ve verified their shipments against OEM specs multiple times, and the results are flawless. They’re now our preferred sourcing partner for critical systems.
- David Smith
Finding authentic automation parts has always been a challenge, especially for discontinued models. IndustriaX Limited has impressed us with their genuine stock, clear product traceability, and prompt updates. We’ve verified their shipments against OEM specs multiple times, and the results are flawless. They’re now our preferred sourcing partner for critical systems.
- David Smith
Professional Service with After-Sales Support"IndustriaX Limited doesn’t just ship products—they provide solutions. When we encountered installation issues with one of the modules, their technical team replied in less than 4 hours and provided wiring guides and troubleshooting tips. This level of post-sale support is rare in the spare parts sector. Their professionalism gives us confidence in every order."
- Emily Brown
"IndustriaX Limited doesn’t just ship products—they provide solutions. When we encountered installation issues with one of the modules, their technical team replied in less than 4 hours and provided wiring guides and troubleshooting tips. This level of post-sale support is rare in the spare parts sector. Their professionalism gives us confidence in every order."
- Emily Brown
Trusted Source for Industrial Automation Spares
We've tested multiple suppliers over the years, but IndustriaX Limited consistently stands out. Their product catalog is extensive, their team is knowledgeable, and they understand the urgency of industrial needs. With every order, we receive timely updates, fast delivery, and 100% genuine products. It’s rare to find such consistency and reliability in this field.
- Michael Anderson
We've tested multiple suppliers over the years, but IndustriaX Limited consistently stands out. Their product catalog is extensive, their team is knowledgeable, and they understand the urgency of industrial needs. With every order, we receive timely updates, fast delivery, and 100% genuine products. It’s rare to find such consistency and reliability in this field.
- Michael Anderson