WAGO 750-375 Coupler

WAGO 750-375 3rd-Generation Advanced PROFINET IO Fieldbus Coupler

Model Segment	Meaning	Detailed Description
750	Product Series	WAGO-I/O-SYSTEM 750, remote I/O system with IP20 protection rating
-375	Product Type	3rd-Generation (Gen.3) Advanced PROFINET IO Fieldbus Coupler
/xxx-xxx	Extended Parameters	Optional suffix. For example, /025-000 stands for wide-temperature version (-25°C to +70°C)

Core Positioning: Connects WAGO 750 series I/O modules to PROFINET IO network. Supports dual controller redundancy and multiple advanced functions.

Category	Technical Data	Remarks
Communication Features
Protocol	PROFINET IO, supporting LLDP, SNMP, HTTP	Compatible with PROFIsafe V2 and PROFIenergy V1.0
Data Transfer Rate	10/100 Mbit/s auto-negotiation	Integrated 2-port switch, supports linear topology
Redundancy	S2 system redundancy, 2 IO Controllers + 1 IO Supervisor	Automatic switchover to backup controller upon main controller failure
Process Image	Max. 250 connection points/nodes, 64 field devices	Supports mixed transmission of analog (word/byte) and digital (bit) signals
Electrical Characteristics
Power Supply	System side: 24VDC (19.2-28.8VDC); Field side: 24VDC (via power jumper)	Typical current: 50mA, Peak current: 150mA
Power Consumption	Typical: 1.2W, Max.: 1.8W
Mechanical Characteristics
Dimensions	W 61.5mm × H 100mm × D 68mm	DIN-35 rail mounting
Protection Class	IP20	Protects against solid foreign objects ≥12.5mm
Weight	Approx. 150g
Environmental Conditions
Operating Temperature	Standard: 0°C to +55°C; Wide temperature: -25°C to +70°C (with suffix /025-000)
Storage Temperature	-40°C to +85°C
Relative Humidity	5% to 95% (non-condensing)
Vibration Resistance	10-58Hz: 0.075mm; 58-150Hz: 1g	Compliant with IEC 60068-2-6
Certifications	CE, UL, CSA, ATEX, IECEx	Compliant with industrial safety standards

3.Full Range of PROFINET IO Coupler Models

Model	Type	Key Features	Order No.
750-375	Advanced Version	2-port switch, S2 redundancy, PROFIsafe V2, PROFIenergy	750-375
750-375/025-000	Advanced Wide-Temperature Version	Wide temperature range (-25°C to +70°C), same functions as 750-375	750-375/025-000
750-377	ECO Advanced Version	Cost-optimized, 1-port, full functions of 750-375	750-377
750-377/025-000	ECO Wide-Temperature Version	Wide temperature range, 1-port, cost-optimized	750-377/025-000
750-352	Basic Version	Basic PROFINET functions, no redundancy, 1-port	750-352

4.1 In-Series Replacement

Old Model	New Model	Replacement Description
750-352	750-375	Upgraded to 3rd generation; added 2-port switch, S2 redundancy and PROFIsafe
750-353	750-377	ECO version upgrade with optimized cost and enhanced functions

4.2 Cross-Brand Comparison

Brand	Model	Function Comparison	Advantages
WAGO	750-375	2-port switch, S2 redundancy, PROFIsafe V2, wide-temperature option	Modular design, cage clamp connection, easy installation
Phoenix Contact	IL PN BK DI8 DO4	Integrated 8DI/4DO, 1-port	All-in-one design, space-saving
Siemens	ET 200SP IM 155-6 PN HF	High protection class, redundancy available	Excellent compatibility with Siemens PLC
Beckhoff	BK9050	High-speed real-time communication, EtherCAT support	Ideal for high-speed motion control
Domestic Alternative	CHINT NXC-PN-01	Basic PROFINET functions, cost-effective	Low price and local technical support

5.1 Applicable Scenarios

Industry	Typical Applications	Core Value
Automotive Manufacturing	Robot control & body inspection in welding workshops	Dual controller redundancy ensures continuous production and reduces downtime
Chemical & Pharmaceutical	Distributed process control, hazardous area monitoring	Wide temperature range for harsh environments; PROFIsafe for safety-related applications
Power & Energy	Substation automation, wind turbine monitoring	Strong EMC performance, supports remote diagnostics
Logistics & Warehousing	Automated warehouse, conveyor line control	Fast data transmission for multi-device coordination
Food & Beverage	Filling line & packaging equipment control	Sanitary design, easy to clean and maintain

5.2 Not Recommended Scenarios

Outdoor installation without extra protection (insufficient IP20 rating)

Environments with direct water contact or corrosive substances

Severe vibration (over 1g) and impact conditions

Zone 0 / Zone 20 hazardous areas requiring EX ia explosion protection (special I/O modules required)

5.3 Application Case: Automotive Welding Workshop

Project Background: An automotive manufacturer expanded remote I/O stations to connect 12 welding robots and 30 sensors & actuators.

Solutions:

Adopt WAGO 750-375 as PROFINET IO coupler to connect S7-1500 CPU.
Equip with 750-1405 (16DI), 750-1504 (16DO) and 750-469 (4AI) modules.
Build linear network via integrated 2-port switch, cutting wiring work by over 30%.

Operation Results:

System response time < 1ms, meeting real-time control requirements.

Redundancy switchover time < 100ms, production line availability up to 99.99%.

Remote diagnostics reduce maintenance workload by 40% and lower operational costs.

6.1 Fault Phenomena & Troubleshooting Procedures

Fault Phenomenon	Possible Causes	Troubleshooting Steps	Solutions
PWR LED off	Power loss or power failure	1. Check 24VDC power supply	1. Reconnect power supply
		2. Measure terminal voltage	2. Replace power module
		3. Inspect power jumper	3. Repair power jumper
LINK LED off	Network connection failure	1. Check Ethernet cable connection	1. Re-plug Ethernet cable
		2. Test cable continuity	2. Replace cable
		3. Inspect switch port	3. Change switch port
USR LED blinking	Configuration error	1. Check GSDML file version	1. Update GSDML file
		2. Verify IP address settings	2. Reconfigure IP address
		3. Check PROFINET parameters	3. Verify PROFINET parameters
No response from I/O modules	Poor module connection	1. Check module assembly	1. Reinstall modules
		2. Check terminator module	2. Fit terminator module
		3. Verify process image configuration	3. Reconfigure process image
Redundancy switchover failure	Incorrect redundancy configuration	1. Check S2 redundancy parameters	1. Reconfigure S2 redundancy
		2. Verify dual controller connection	2. Fix controller connection
		3. Check PROFINET redundancy settings	3. Verify redundancy parameters

6.2 Maintenance Schedule

Maintenance Item	Cycle	Operation Content
Visual Inspection	Monthly	Check for damage and overheating
Connection Inspection	Quarterly	Check loose wiring, especially power and Ethernet cables
Firmware Update	Semi-annually	Check official WAGO website for latest firmware and update if needed
Function Test	Annually	Simulate faults to test redundancy switchover and diagnostic functions

Selection Tips

Choose 750-375 for PROFINET, strong dual-port and redundancy performance;

Add suffix /025-000 for wide temperature, pick 750-377 for ECO solution;

Ideal for automotive, chemical and power industries, indoor use with IP20;

Tool-free cage clamp wiring, stable performance under vibration.

Quick Reference Rules

750 refers to the base series; 375 stands for advanced PROFINET version.
2-port switch, redundancy and PROFIsafe are three core advantages of 750-375.
Add suffix /025-000 for wide temperature; select 750-377 for cost control.
A terminator module (e.g. 750-891) is mandatory for normal operation.
Supports up to 64 field devices and 250 connection points.
Key Features Summary
3rd-Generation PROFINET Technology: Compliant with latest PROFINET standards for stable and high-speed communication.
Dual Controller Redundancy: Adopts S2 system redundancy protocol to ensure continuous operation of critical systems.
Integrated 2-Port Switch: No extra network devices required, cost-effective for linear topology construction.
PROFIsafe V2 Support: Meets safety application requirements up to SIL 3.
Wide Operating Temperature: Standard range 0°C ~ +55°C; wide-temperature version -25°C ~ +70°C.
Cage Clamp Connection: Tool-free fast wiring, excellent vibration resistance with contact resistance variation < 0.5mΩ.