B&R 7AO352.70 is a high performance live isolated receiver module in B&R automation systems, specifically designed for signal isolation and secure transmission in industrial control systems. As a core component of the MIDI/MULTI module rack system, 7AO352.70 provides 16-channel digital input isolation to meet the EN 61131-2 Type 1/Type 3 signal standard. This module achieves electrical isolation between the 24VDC sensor signal and the control system in the PLC control cabinet, eliminating grounding loop interference. It is particularly suitable for high electromagnetic interference environments such as automotive welding production lines.
With the innovative Galvanic Isolation Pro technology, B&R 7AO352.70 achieves 3750Vrms isolation voltage between adjacent channels and 1500VAC isolation strength between channel groups. The module supports pulse signal acquisition within the frequency range of 0.1-100Hz, ensuring a measurement accuracy of ±0.01% in high-speed counting applications of packaging machinery. Its compact design allows up to 32 modules to be configured in a single MIDI rack, providing a high-density signal processing solution for petrochemical DCS systems.
Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Model | 7AO352.70 |
| Manufacturer | B&R Automation |
| Type | Electrically Isolated Digital Input Module |
| Channels | 16 (4 groups) |
| Input Voltage | 24VDC ±20% |
| Isolation | 3750Vrms (channel), 1500VAC (group) |
| Frequency Range | 0.1Hz-100kHz |
| Power Consumption | 1.8W (typical) |
| Response Time | ≤1ms |
| Operating Temp | -25°C to +60°C |
| Humidity | 5-95% non-condensing |
| Certification | UL 508, CE, IEC 61131-2 |
Key Features and Advantages:
Smart diagnostics: Real-time channel fault detection (open-circuit/short-circuit) via LED indicators minimizes MTTR to <3 minutes in automotive assembly lines. Built-in HMI synchronization supports dual redundancy configurations for nuclear plant safety systems.
Dynamic adaptation: Automatic cable compensation maintains ≤±0.1% accuracy over 300m cable runs in offshore drilling platforms. The hybrid terminal design accepts both spring-loaded and screw-type connections, reducing cabinet wiring time by 40%.
Safety compliance: Achieves SIL2 certification per IEC 61508 with TÜV-certified isolation barriers, suitable for petrochemical ATEX Zone 2 applications.
Application Areas:
- Power Generation: Excitation system monitoring (compatible with IEC 61850-3)
- Automotive: Robotic weld cell safety interlocks (ISO 13849 PL d)
- Water Treatment: Chlorine dosing pump control (NEMA 4X/IP66)
- Pharmaceutical: Cleanroom conveyor status monitoring (GMP Class C)
In steel rolling mills, the 7AO352.70’s 100kHz sampling rate enables precise strip thickness monitoring with ≤5μm resolution.
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Installation and Maintenance:
Installation preparation: Verify supply voltage stability (±2%) before mounting 7AO352.70 in Class I Div 2 environments. Use CAT6 STP cables with 360° shielding for installations near VFDs.
Maintenance recommendations: Perform annual dielectric strength tests (2.5kV AC/1min) using calibrated HIPOT testers. Replace terminal springs every 50,000 insertion cycles in high-vibration cement plants.
Product Assurance:
B&R provides 12-month extended warranty with lifetime technical support. Each 7AO352.70 undergoes 168-hour accelerated aging tests (-40°C~+85°C thermal cycling + 95%RH humidity). Global service network guarantees 4-hour emergency response for critical infrastructure clients.
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