Electrical Data - Burkert 8681 Operating Instructions Manual

Control Head Type 8681
ASInterface-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
Multi-pole (cable 8 cm)
Multi-pole (cable 80 cm)
Example:
for multi-pole connection with 8 cm cable:
When using 62 control heads, the AS interface cable harness may still be (100 m - 62 * 0.3 m) = 81.4 m long.
If the calculated line length of 100 m were to be exceeded, a commercially available AS interface repeater may be
used, as needed.
Observe maximum power supply via certified AS interface power supply units ≤ 8 A!
For details see AS interface specification.
Observe the optional design "AS Interface with External Power Supply" to reduce the load on the AS interface
bus segment! (see Chapters "11.4" and "11.7")
Use cables according to the AS interface specification.
If other cables are used, the maximum cable length will change.
11.4.

Electrical data

Comments / notes:
Outputs (from master perspective):
Inputs (from master perspective):
Watchdog:
Setting the solenoid valves' power supply using jumpers on the AS interface electronics module:
Via AS interface
Jumper
Fig. 18: Jumper settings for power supply via AS interface or for external power supply
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.
Calculated line length
(including internal cabling)
0.3 m
1.0 m
0 to 3 solenoid valves
3 binary feedback signals and 1 external initiator
If bus communication fails for more than 50 to 100 ms, the
outputs are set to 0
(Connection see Chapter "11.7. Electrical installation
English
Externally
of the AS interface")
Jumper
45