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Unauthorised personnel must not be able to open the instrument. AW400 is defined as an instrument "with no
accessible parts under dangerous voltage".
3.4.2 Digital I/O pc board
3.4.2.1 Digital Outputs
AW400 digital outputs are provided by seven (7) relays.
The function of each output contact depends on the type of instrument selected and its configuration. The
different possibilities are detailed in the sections dedicated to each specific type of instrument, as detailed
under each specific instrument section.
Fig. 5 shows how the terminal number assigned to each CCO on the I/O pc board.
The rating of relays are:
• 24 Vdc or 24 Vac
• 5 A max.
• 95-115 mW
Characteristics of commutation are:
• max voltage: 380Vac, 300Vdc
• max current: 8A
• max capacity: 50W-270W in alternate current; 2000W in direct current.
CCO 1 CCO 2 CCO 3 CCO 4 CCO 5 CCO 6 CCO 7
1 2 3 4 5 6 7 8 9 1011121314
Fig. 5 – Relays interconnection terminal barrier
Any valve or device connected to AW400 contact outputs
CAUTION! must be chosen and wired in order to be fail safe.
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