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 following table and example calculation).
Model
Multi-pole (cable 8 cm)
Multi-pole (cable 80 cm)
Calculated line length
(including internal cabling)
0.3 m
1.0 m
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:
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
Setting the solenoid valves' power supply using jumpers on the AS interface electronics module:
Via AS interface Externally
(Connection see Chapter “11.7. Electrical installation of the AS interface”)
Jumper 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.
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Control Head Type 8681
ASInterface-Design
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Connections:
Multi-pole connection version: 1 x M16 x 1.5 cable gland / SW19 with multi-pole connection
(M12 plug according to IEC 61076-2-101, 4-pole on a cable of 8 or
80 cm length for power supply and signals)
Power supply:
1 x M16 x 1.5 cable gland/SW19 - connection option for external initiator
(sealed with dummy plug, remove these before use)
29.5 ... 31.6 V DC (according to specification)
21.0 ... 31.6 V DC (according to specification Power24)
Input / proximity switches (external initiator: S4 in):
Power supply:
Current carrying capacity,
AS interface voltage present at control head - 10% sensor power supply: max. 30 mA
Short-circuit protection design:
Input current 1 signal:
Input voltage 1 signal: U
Input current 0 signal:
DC 2- and 3-conductor,
NO or NC (factory setting NO), PNP output
I
I
Sensor
Sensor
Sensor
Input voltage 0 signal: U
> 6.5 mA, limited internally to 10 mA
Sensor
> 10 V
< 4 mA
< 5 V
Inputs (from master perspective) / binary feedback signals:
The recovery of the 3 valve positions reported back in binary format is described in Chapter “16” on page 75.
Outputs (from master perspective) / solenoid valves:
Max. switching capacity: max. 0.9 W (per solenoid valve)
Typ. continuous output: 0.6 W (per solenoid valve)
Watchdog function: integrated
Output reduction:
Pull-in current:
Holding current:
Operating mode:
Valve type:
via AS interface - electronics integrated
30 mA or 0.9 W/200 ms (at 30.5 V AS-i voltage)
20 mA or 0.6 W (at 30.5 V AS-i voltage)
Long-term operation (100% ED)
Type 6524
Central display of the switching states:
Power consumption from AS interface
at 30.5 V AS interface voltage: max. 33 mA or 1 W per illuminated display
Number of representable colors: 2 colors for process valve switching states
1 color for signaling a fault
For "universal color switching" see Chapter”17. LED Color Assignments”.
Power supply via AS interface bus (without external power supply):
Max. power consumption from AS-i: 200 mA (incl. external initiator with 30 mA)
Power consumption during normal operation from the AS-i
(after current reduction): ≤ 150 mA
3 valves activated, 1 position reported back by LED display, no external initiator
Integrated short-circuit protection
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