Application Scenarios
In a water treatment plant, a PLC-based control system must regulate chemical dosing pumps based on flow rate measurements. Each pump accepts a 4–20 mA signal for speed control, but the existing control cabinet has limited DIN rail space and the wiring terminals loosen under continuous vibration from nearby blowers. The WAGO 750-555 addresses both issues: its 12 mm width allows four analog output channels to fit in the space previously occupied by a single traditional module, while the CAGE CLAMP spring connection technology eliminates loose wires caused by vibration and temperature cycling . When the plant later expands with two additional dosing lines, technicians simply snap another 750-555 onto the rail and configure the new channels through the existing bus coupler—no rewiring of the entire analog loop is required.
Parameter
| Parameter | Value/Description |
|---|---|
| Product Model | 750-555 |
| Manufacturer | WAGO |
| Product Category | Analog Output Module |
| Number of Outputs | 4 |
| Signal Type | 4–20 mA |
| Resolution | 12 bits |
| Conversion Time | 10 ms (typical) |
| Load Impedance | 0–300 Ω or 300–600 Ω (same range for all channels) |
| Supply Voltage (System) | 5 VDC via data contacts |
| Supply Voltage (Field) | 24 VDC (-25% to +30%) via power jumper contacts |
| Current Consumption | 60 mA (5 V system supply) |
| Isolation | 500 V system/field |
| Dimensions (W×H×D) | 12 × 100 × 69.8 mm |
| Operating Temperature | 0°C to +55°C |
| Protection Rating | IP20 |
| Mounting | DIN-35 rail |
| Connection Technology | CAGE CLAMP (0.08–2.5 mm² / AWG 28–14) |
Technical Principles and Innovative Values
Innovation Point 1 — Four Channels in a 12 mm Slice: The 750-555 packs four independent 4–20 mA output channels into a module just 12 mm wide. This density allows system integrators to add analog control points without expanding cabinet footprint—a critical advantage when retrofitting existing panels where space is fixed and downtime for enclosure modification is unacceptable .
Innovation Point 2 — CAGE CLAMP Vibration Immunity: The spring-pressure CAGE CLAMP connection eliminates screw terminals that loosen under the vibration and thermal cycling common in industrial environments. WAGO designed this technology specifically to provide maintenance-free, corrosion-resistant connections, which directly reduces callbacks for loose-wire faults in the field .
Innovation Point 3 — Field-Side Power with Galvanic Isolation: The 750-555 draws power for its current outputs from the field-side 24 VDC supply, while maintaining 500 V galvanic isolation between the system and field levels . This means a fault in the field wiring cannot propagate back to damage the PLC or bus coupler, protecting the more expensive upstream components.
Innovation Point 4 — Common Ground with Configurable Load Range: All four output channels share a common ground potential, simplifying wiring when multiple actuators connect to the same power supply return. The module supports either 0–300 Ω or 300–600 Ω load impedance ranges, accommodating a broader range of field devices without external signal conditioners .
