Burkert 8681, Operating Instructions Manual, Page: 54 / 166

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AS Interface - Design
12.2 Electrical connection options for AS interface
The following connection concepts are available for the electrical connection of the control head:
Cable gland with multi-pole connection
(M12 plug according to IEC 61076-2-101, 4-pole),
cable length approx. 15 cm
Cable gland with multi-pole connection
(M12 plug according to IEC 61076-2-101, 4-pole),
cable length approx. 80 cm
Connection left: AS interface
Connection right: external initiator Connection left: AS interface
Connection right: external initiator
Fig. 21: AS interface connection concepts
12.3 Number of connectable control heads
The level of expansion that is actually possible depends on the total number of all individual operating currents
for each control head, which are supplied via the bus at the common AS interface bus segment (see chapter
“12.6 Design aid” ).
Standard: AS interface/62 slaves
(AS interface version with extended addressing range (A/B slave))
In AS interface versions with extended addressing range (A/B slave), 1 master can communicate with 62
slaves.
Option: AS interface/31 slaves
(AS interface version with 31 slave addressing range)
In this case, a maximum of 31 control heads can be connected to a bus line (address range restriction).
12.4 Maximum length of the bus line
The bus cable may be a maximum of 100 m long. All AS interface lines of an AS interface string must be con-
sidered for the design, i.e. even the drop lines to the individual slaves and the cabling inside the control head.
When designing the system, the
calculated line length of the cable at the control head must be either 0.3
or 1 m (see the following „Table 1“). This takes into account the outer and inner cable lengths (see also the
following example calculation).
english
Control Head Type 8681