WAGO 750-970
€ 79,00
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The WAGO 750-970 is a fieldbus-independent power supply module belonging to the WAGO-I/O-SYSTEM 750 series, a modular I/O system designed for use with programmable logic controllers and fieldbus-based automation architectures. This module provides an internal power supply feed for the WAGO 750 node, allowing the system to segment power supply sections within a larger I/O assembly. The SKU 750-970 is manufactured by WAGO and is specifically used to inject a new 24 V DC supply potential into the internal data and power bus of the 750 series node.
The 750-970 power supply module accepts a 24 V DC input and feeds this voltage into the internal bus to power subsequent I/O modules in the assembly, enabling independent power zones within a single node. It supports the WAGO 750 series internal bus architecture, ensuring compatibility with the full range of 750 series digital and analog I/O modules. The module features a compact design with spring-clamp CAGE CLAMP terminal connections for reliable, tool-free wiring, and is rated for operation across an industrial temperature range. It carries relevant CE and UL certifications and is designed to meet the demands of continuous industrial operation.
The 750-970 is widely deployed in manufacturing automation, process control, building automation, and machine tool applications where segmented power distribution within a WAGO I/O node is required. It is particularly useful in installations where different sections of I/O modules must be powered from separate supply circuits for safety, load management, or fault isolation purposes. Industries such as automotive manufacturing, food and beverage processing, water treatment, and energy management commonly use this module as part of larger WAGO 750 series fieldbus nodes.
Technical Specifications
| Input Voltage | 24 V DC |
|---|---|
| Voltage Tolerance | -15% / +20% |
| Input Current (max) | 2 A |
| Output Current (Internal Bus) | Up to 2 A |
| Power Dissipation | < 1 W |
| Operating Temperature | -20 °C to +55 °C |
| Storage Temperature | -25 °C to +85 °C |
| Relative Humidity | 5% to 95% (non-condensing) |
| Connection Method | CAGE CLAMP spring-clamp terminals |
| Conductor Cross-Section | 0.08 mm² to 2.5 mm² |
| Mounting | DIN 35 rail (EN 60715) |
| Width | 12 mm |
| Protection Rating | IP20 |
| Series/Product Family | WAGO-I/O-SYSTEM 750 |
| Certifications | CE, UL, ATEX (dependent on configuration) |
Common System Event Codes
- I/O Module Configuration Error
- The fieldbus coupler detects a mismatch between the configured and detected I/O module sequence, which can occur if the 750-970 power feed module is missing or incorrectly positioned in the node.
Verify the physical order of all modules in the node matches the configuration in the controller or WAGO-I/O-CHECK software. Ensure the 750-970 is seated correctly on the DIN rail and making proper contact with adjacent modules. - Internal Bus Fault
- The coupler reports an internal bus communication failure, which may indicate a broken or interrupted internal bus connection caused by a faulty or improperly installed 750-970 module.
Inspect the 750-970 module for physical damage. Remove and reseat the module on the DIN rail. Check that all adjacent modules are properly connected and that no module is misaligned. - Supply Voltage Undervoltage
- The 24 V DC supply fed through the 750-970 has dropped below the minimum operating threshold, causing downstream I/O modules to lose power.
Measure the 24 V DC supply at the input terminals of the 750-970 using a multimeter. Verify the power supply unit feeding this module is functioning correctly and that wiring connections are secure. - Overcurrent on Internal Bus
- The total current drawn by I/O modules powered through the 750-970 exceeds the rated output current of the module, potentially causing thermal shutdown or module damage.
Calculate the total current consumption of all I/O modules downstream of the 750-970. Redistribute modules or add an additional 750-970 power feed module to reduce the load on any single supply section. - Module Not Recognized
- The fieldbus coupler does not recognize the 750-970 in the node scan, typically due to a defective module or poor contact on the internal bus connectors.
Remove the 750-970 and inspect the internal bus contacts for contamination or damage. Clean contacts if necessary and reseat the module. Replace the module if the fault persists. - Node Configuration Mismatch
- After a module replacement or reconfiguration, the coupler reports that the detected node configuration does not match the stored or programmed configuration.
Use WAGO-I/O-CHECK or the associated fieldbus configuration tool to re-scan the node and update the configuration. Ensure the 750-970 is accounted for in the module list and that the node end module is correctly installed.
Frequently Asked Questions
What is the function of the WAGO 750-970 within a 750 series node?
The 750-970 is an internal power supply module that injects a fresh 24 V DC supply into the internal bus of a WAGO 750 series I/O node. It allows the node to be divided into separate power supply sections, enabling independent powering of different groups of I/O modules.
Is the 750-970 compatible with all WAGO 750 series fieldbus couplers?
Yes, the 750-970 is designed to be compatible with the full range of WAGO 750 series fieldbus couplers and controllers, including those for PROFIBUS, PROFINET, EtherNet/IP, Modbus, and other supported fieldbus protocols.
How many 750-970 modules can be used in a single WAGO 750 node?
Multiple 750-970 modules can be used within a single node to create several independent power supply sections. The total number is limited by the maximum number of modules supported by the specific coupler or controller used in the node.
What wiring connection method does the 750-970 use?
The 750-970 uses WAGO CAGE CLAMP spring-clamp technology, which allows tool-free insertion and removal of conductors with cross-sections from 0.08 mm² to 2.5 mm², providing a vibration-resistant and maintenance-free connection.
Does the 750-970 occupy a logical slot in the fieldbus node configuration?
Yes, the 750-970 is recognized as a module within the node and occupies a position in the module sequence. It must be accounted for in the node configuration within the fieldbus master or PLC engineering software.
Troubleshooting
I/O modules downstream of the 750-970 are not powered or responding
Measure the 24 V DC voltage at the input terminals of the 750-970 with a multimeter. Check whether the LED indicators on downstream modules are off, indicating a loss of supply voltage on the internal bus.
Verify that the external 24 V DC power supply connected to the 750-970 is operational and within tolerance. Check and tighten all wiring connections at the 750-970 terminals. If the supply is confirmed good but modules remain unpowered, replace the 750-970 module.
Fieldbus coupler reports a node configuration error after installing the 750-970
Connect to the coupler using WAGO-I/O-CHECK software and perform a node scan to compare the detected module list against the configured module list. Identify whether the 750-970 is being detected in the correct position.
Update the node configuration in the engineering software to include the 750-970 at the correct position. Re-download the configuration to the coupler and restart the node. Ensure the module is fully seated on the DIN rail.
Intermittent loss of I/O data from modules in a specific section of the node
Inspect the 750-970 module and its neighboring modules for signs of poor mechanical contact on the DIN rail. Check for loose wiring at the 750-970 supply terminals and measure supply voltage under load conditions.
Reseat the 750-970 and adjacent modules on the DIN rail to ensure proper internal bus contact. Tighten supply wiring connections. If the supply voltage drops under load, verify the external power supply capacity is sufficient for the connected I/O load.
Physical damage or burn marks visible on the 750-970 module
Inspect the module visually for signs of overheating, discoloration, or melted plastic, which may indicate an overcurrent condition or incorrect supply voltage was applied.
Disconnect power and remove the damaged 750-970 module. Investigate the root cause, such as excessive current draw from downstream modules or incorrect supply voltage. Correct the underlying issue before installing a replacement module.
| Condition | Repair, Used, Refurbished, New in box (sealed) |
|---|
Common defects
Common defects on a WAGO 750-970 are:
Power Supply & Hardware
- No power / PLC not starting
- Blown fuses or power components
- Faulty internal power supply module
- Overheating due to poor cooling or fan failure
- Damaged capacitors or power circuits
Input & Output (I/O) Failures
- Digital inputs not responding
- Analog inputs showing incorrect values
- Digital outputs not switching or stuck
- Burnt or damaged relay / transistor outputs
- I/O modules not recognized or defective
Communication Problems
- No communication with HMI or SCADA
- Network issues (Profibus, Profinet, Modbus, Ethernet/IP, CAN, etc.)
- Serial communication (RS232/RS485) failure
- Fieldbus module malfunction
- Outdated or incompatible firmware causing errors
Memory & Software Issues
- Lost parameters or corrupted programs (EEPROM/Flash failure)
- PLC loses program after power-down
- Firmware corruption or software errors
- Faulty or empty backup battery
- Errors during upload/download of program
CPU & Processing Errors
- PLC freezes or resets unexpectedly
- CPU not responding to commands
- Error messages during startup or runtime
- Watchdog timer faults or internal CPU errors
- Synchronization issues with other modules
Mechanical & Physical Damage
- Broken PCB tracks or connectors
- Corrosion due to moisture or chemicals
- Contamination from dust, oil, or dirt
- Burnt components or discolored boards
- Poor solder joints (dry joints)
Other Failures
- Faulty display or diagnostic LEDs
- Non-functional buttons or keypad
- Expansion modules not detected
- Defective internal clock or timers
- EMI/RFI noise due to damaged filters
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