Burkert Type 8681 - Manual (Page 40)

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AS Interface - Design
table of calculated line length of the control head versions:
When designing the system, consider the length of the round cable leading directly to the control head (see fol-
lowing table and example calculation).
Model calculated line length (incl. internal cabling)
Multi-pole (cable 8 cm) 0.3 m
Multi-pole (cable 80 cm) 1.0 m
example:
for multi-pole connection with 8 cm cable:
The AS interface cable harness may still be 81.4 m (100 m - 62 * 0.3 m) at maximum when using 62 control
heads.
If the calculated line length of 100 m were to be exceeded, a commercially available AS interface repeater may be
used, as needed.
Observe the maximum power supply using certified AS Interface power supplies ≤ 8 A!
For details, refer to the AS Interface Specification.
Observe the optional design "AS Interface with External Power Supply" to reduce the load on the AS interface
bus segment!
Use cables according to the AS Interface Specification.
The maximum cable length may change when using other cables.
electrical data 11.4.
Comments / notes:
Outputs (from master perspective): 0 to 3 solenoid valves
Inputs (from master perspective): 3 binary feedback signals and 1 external initiator
Watchdog: If bus communication fails for more than 50 up to 100 ms, the
outputs are set to 0
Setting the valve's power supply using jumpers on the AS interface electronics module:
via AS interface Externally
(Connection see chapter 11.7. Electrical installation
AS Interface)
Jumper Jumper
The Control Head Type 8681 was developed according to the Complete Specification (V.3.0) and the Profile
S-7.A.E and S-7.F.F of the AS International Association.
english
Control Head Type 8681