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Analog outputs
If you are looking for information on the Extension xS52, xS53 and xS54, please see Analog inputs - type 2
Analog inputs type 1 are available in the Extension xS51. To measure voltage or current, the negative pole of the external device to be measured is connected to the AGND terminal of the connector and its positive pole (signal) to the AIx (or AIy.x) terminal. The wiring for resistance measurement varies depending on the measurement mode.
Please note:
In its factory settings, the device is set to voltage measurement to prevent any potential damage of connected devices or sensors in case an unsuitable device/sensor is connected.
Attention:
Before connecting the measuring device, it is necessary to check measurement settings by the chosen software and according to the type of the connected device - see the measurement description below.
Connection
The following images illustrate the setup for measuring a voltage and current source on AI and AGND terminals.
Voltage measurement
Current measurement
Resistance sensors can be connected to analog inputs using a two-wire or three-wire method. The three-wire method holds the advantage of preventing measuring errors caused by the resistance of the used wire.
Two-wire method
Three-wire method
Mode description
Analog inputs on Extension xS51 can perform accurate measurements of current, voltage or resistance. Measurement mode needs to be set first in the control software. In voltage and resistance mode you can choose from two accuracy modes. The measured value is of float32 (real) data type and corresponds with the measured input value (V⎓, mA, Ω).
This type of analog input supports the following modes:
- 0–10 V⎓ voltage
- 0–2.5 V⎓ voltage
- 0–20 mA current
- 0–1960 Ω resistance (three-wire)
- 0–100 kΩ resistance (two-wire)
Technické parametry
| Input terminals | AI, AIS |
| Common conductor | AGND |
| Galvanic isolation | Yes |
| Input functions | 0–10 V⎓ voltage measurement, 0–20 mA current measurement, 0–1960 Ω or 0–100 kΩ resistance measurement |
| Resolution | 24 bits (resistance measurement), 16 bits (voltage and current measurement) |
| Conversion time | 400 ms (resistance measurement), 60 μs (voltage and current measurement) |
| Protection type | Integrated overvoltage protection |
| Maximum input voltage | 15 V⎓ |
| Measurement accuracy | ±0.2 % |
| Input resistance (voltage measurement) | 44 kΩ |
| Input resistance (current measurement) | 100 Ω |
