WAGO I/O System 750/753 Series Distributed Automation System

WAGO I/O System 750/753 Series Distributed Automation System

Core positioning and purpose of the system

Core function: Receive digital/analog signals from sensors, control actuators, communicate with higher-level controllers through fieldbus interfaces, and support signal preprocessing.

Applicable scenarios: Indoor dry environments in the field of industrial automation, suitable for ordinary industrial areas, and certified for special scenarios such as marine, nearshore, explosion-proof (Ex i), functional safety, etc.

Installation requirements: As an open device, it needs to be installed in an additional enclosure and operated by professional electrical personnel according to standards such as EN 50110-1/-2 and IEC 60364.

System hardware structure and characteristics

1. Classification and functions of core components

Specific classification of component types and key characteristics

Head Stations' fieldbus couplers, controllers, and PFCs provide fieldbus interfaces (such as PROFINET and ETHERNET) to manage I/O module communication and power supply, with reset keys, status indicator lights, and service interfaces

I/O module analog input/output module supports voltage and current signal acquisition and output, distinguished by color coding (green=analog input, blue=analog output)

The digital input/output module is adapted to switch signals, with color codes of yellow (input) and red (output)

Functional/technical modules include relay module, communication module, filtering module, and transparent shell identification

The power/segment module provides system/on-site power supply, supports potential partitioning, and can interrupt or switch power supply links

The auxiliary component end module is used for node end sealing to ensure mechanical stability

Distance module (750-616) is used to increase creepage distance in explosion-proof scenarios, with a width of 12mm

2. Module physics and connection characteristics

Appearance and coding:

Types of shell color differentiation: light gray (standard module), blue (Ex i explosion-proof), signal yellow (functional safety), dark gray (750 XTR).

Marking information: including product model, wire cross-section, production data, DataMatrix code, CE/UL/Ex certification identification, etc. The head station serial number is marked on the service interface cover plate.

Connection technology:

CAGE CLAMP ®： It needs to be opened with operating tools and supports solid, multi strand, and thin multi strand conductors (0.08-4mm ²).

Push-in CAGE CLAMP ®： Tool free direct insertion (multi strand/thin multi strand conductors with cold pressed ends, solid conductors), other conductors require tool assistance.

Mechanical parameters:

Module width: 12mm, 24mm, 48mm, maximum node length (from head station to end module) ≤ 768mm.

Installation adaptation: 35mm DIN rail, fixed by locking cam, supports horizontal (left/right/up/down) and vertical (up/down) installation posture.

3. Electrical structure and power supply

Potential level:

System level: including system power supply (24VDC), local bus signals, and electrical isolation from other levels.

On site level: including on-site power supply (24VDC/230VAC, etc.), I/O signals, and can be divided into multiple potential zones.

Fieldbus level: independent of the first two, voltage/current depends on the fieldbus standard.

Power supply requirements:

System power supply: SELV/PELV power supply is required, and the total current of a single node should not exceed the rated value of the module. It is recommended to use the same voltage source for power supply.

On site power supply: configured according to the load, supporting different voltages in multiple areas (such as 24VDC, 230VAC), and requiring overcurrent protection (integrated fuse power module or external fuse).

Buffer requirements: When meeting the IEC 61131-2 standard, an external buffer module (such as UPS, capacitor buffer) is required.

System Planning and Installation Specification

1. Core requirements for node planning

Node composition: It should include at least one head station, one power module, one I/O module, and one end module, and support up to 250 addressable I/O modules.

Security planning:

In hazardous voltage scenarios, DIN rails must be grounded (PE) to ensure electrical connection with the enclosure/frame.

Control lines, signal lines, and power lines need to be spatially separated to avoid electromagnetic interference.

Data security: control the isolation of the network from the Internet/office network, close useless ports, change passwords regularly, and adopt the "defense in depth" mechanism.

Installation gap:

Both sides of the node should be ≥ 20mm, and the top and bottom should be ≥ 35mm (if the top is a heating component, it should be ≥ 65mm), to avoid blocking heat dissipation.

2. Installation and disassembly steps

Installation process:

Head station installation: The buckle is fixed on the DIN rail, and the locking cam is rotated with a tool to engage.

I/O module installation: Assemble from left to right in sequence, press until the buckle is locked. The 753 series requires fixing the module before connecting the wiring interface.