The safety-related F3 AIO 8/4 01 remote I/O is a compact system in a metal housing with 8 analog inputs and 4 analog outputs.The remote I/O is available in various model variants for SILworX and ELOP II Factory, seeTable 10.Remote I/Os are connected to individual HIMax or HIMatrix controllers via safeethernet. They are used to extend the I/O level, but are not able to run any user program by themselves.The remote I/O is suitable for mounting in Ex-zone 2, see Chapter 4.1.4.The device is TÜV-certified for safety-related applications up to SIL 3 (IEC 61508, IEC 61511and IEC 62061), Cat. 4 and PL e (EN ISO 13849-1) and SIL 4 (EN 50126, EN 50128 andEN 50129).
Key Parameters
- Analog Inputs:
Channels: 8 channels (configurable for 4–20 mA, 0–10 V DC, or thermocouple/millivolt signals).
Resolution: 16-bit ADC (0.0015% accuracy after calibration).
Isolation: 1500 V AC (channel-to-channel, channel-to-system).
- Analog Outputs:
Channels: 4 channels (4–20 mA or 0–10 V DC).
Resolution: 16-bit DAC (±0.1% full-scale accuracy).
- Safety Standards:
Certifications: IEC 61508 SIL 3, TÜV Rheinland, ATEX/IECEx Zone 2.
Hardware Fault Tolerance (HFT): 1 (per IEC 61508).
- Environmental Ratings:
Operating Temperature: -40°C to +70°C (-40°F to +158°F).
Humidity: 5–95% non-condensing.
Safety Function
The remote I/O is equipped with safety-related analog inputs. The input values on the inputs aresafely transmitted to the connected controller via safeethernet. The outputs are safely assignedtheir values by the connected controller via safeethernet.
- Safety-Related Analog Inputs
The remote I/O is equipped with 8 analog inputs with transmitter supplies for the unipolar measurement of voltages, referenced to L-.
The remote I/O is intended to measure the voltage on the inputs. To measure the current on theinputs, the inputs must be connected with external shunt adapters, see Table 4.
Only shielded cables must be connected to the analog inputs. Each analog input must be connected to a twisted pair of wires. The shielding must be connected to the remote I/O and the sensor housing and earthed of one end to the remote I/O side to form a Faraday cage.
If an open-circuit occurs during voltage measurement (the line is not monitored), any input signals are processed on the high-resistance inputs. The value resulting from this fluctuating input voltage is not reliable; with voltage inputs, the channels must be terminated with a 10 kΩ resistor. The internal resistance of the source must be taken into account.
For a current measurement with the shunt connected in parallel, the 10 kΩ resistor is not required.
The analog inputs are designed to retain the metrological accuracy for 10 years. A proof test must be performed every 10 years.
- Reaction in the Event of a Fault
If the device detects a fault on an analog input, the AI.Error Code parameter is set to a value greater than 0. If a device fault occurred, the SILworX system parameter Module Error Code is set to a value greater than 0, or if ELOP II Factory is used, the Module.Error Code signal is set to a value greater than 0.
In both cases, the device activates the FAULT LED.
In addition to the analog value the the error code must be evaluated. The analog value must be configured to ensure a safety-related reaction.
The error code allows the user to configure additional fault reactions in the user program.
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