Spectrex SafEye 300 Series, Руководство пользователя

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Electrical Specifications
34 SafEye TM Open Path Detection System User Guide
4.2 Electrical Specifications
• Operating Voltage : 18 – 32 VDC
Power Consumption
Detector 200 mA at 24 VDC (250 mA peak)
Source 250 mA at 24 VDC (450 mA peak)
• Electrical input protection :
The input circuit is protected against voltage-reversed polarity, voltage
transients, surges, and spikes according to MIL-STD-1275A.
• Electrical Interface (see Figure 5).
• Electrical outputs.
4.2.1 4
–20mA Current Output
The 4 – 20mA is a source configuration. The maximum permitted load
resistance is 600ohm.
There are 2 options for 4
–
20mA:
• Continuous reading - default (see Table 4)
• Discrete reading (see Table 5)
4.2.2 Communications Network
The detector is equipped with an RS 485-communication link that can be
used in installations with computerized controllers.
Communication is compatible with the Modbus protocol:
• This protocol is standard and is widely used.
• It enables continuous communication between a single standard
Modbus controller (master device) and a serial network of up to 247
detectors.
• It enables connection between different types of SPECTREX detectors
or other Modbus devices to the same network.