Fieldbus Interface (Diq/S 281-Mod); Behavior Of The System To A Power Failure - Xylem DIQ/S 281 Operating Manual

Overview
10
The USB interface is equipped with a protective cover.
Only remove the protective cover when you want to connect a USB
device. Immediately close the USB connection again when you
have removed the USB device.
When the USB connection is open, there is a danger of corrosion.

1.2.2 Fieldbus interface (DIQ/S 281-MOD)

The following variants of the DIQ/S 281 have a fieldbus interface:
DIQ/S 281 variant
DIQ/S 281-MOD
1.3

Behavior of the system to a power failure

 The system configuration is permanently retained. It consists of the following
settings:
– Sensor settings
– Settings and links of the relay outputs
– Settings of the current outputs
– System settings (display language, air pressure/altitude, passwords etc.)
 Linked relay outputs switch to the non-active condition (open).
 Current outputs switch to the non active-condition (0 mA).
 A restart is carried out automatically when the power returns. The continues
working with the settings of the time prior to the power failure.
If the power failure lasted several hours the system clock has to be reset.
Fieldbus connection
Modbus RTU/RS 485
DIQ/S 281
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03/2023