Installation technology in IP67

The familiar yellow cable is not just a symbol for the legendary efficiency of AS-Interface , it is also one of the reasons for it. Even its basic geometry offers significant advantages. In contrast to the round cables used in conventional automation systems, no plugs or tees are needed for connecting modules to the ASi flat cable. This saves not only material but also a great amount of time in installation and documentation – while at the same time providing virtually limitless topological freedom. The following articles deal with the installation technology in IP67.

Connection to ASi with profile cable or round cable

Linking to ASi is made by the yellow or the black ASi profile cable (left) with penetration technology or using the M12 round cable (right).

Profile cable and round cable under the magnifying glass

The profile cable is available with a conductor cross-section of 1,5 mm² or 2,5 mm².


ASi together with M12 allows you to use commonly available plugs and cables. The typical conductor cross-sections for M12 cables are less than 0.4 mm². The conductor cross-section has an affect on the cable protection.

Cable protection

Cable protection is usually made at the feeding point. Many masters and gateways have an integrated 4 A-Fuse for the ASi cables . The cable protection depends on the conductor cross-section and the power supply capacity.

Installation of profile cable and round cable

Profile cable

  • The special shape ensures that the cable is routed correctly
  • No additional hardware necessary
  • Cable is simply unrolled from the cable reel in the desired length




Round cable

  • Requires an M12 tee for connecting
  • Pre-assembled cables must be kept in stock in various lengths
  • Assembling the cables on-site is prone to mistakes

Installation with profile cable

The IP67 modules are suitable as a start or end point of the profile cables. No additional end caps are required. The ASi/AUX profile cable can begin or end directly in the module (IP54).

Profile cable and round cable in combination

ASi profile cables can be used through a passive distributor in combination with an M12 connector. The optimal installation for any application.

Simple and secure application

Mounting mechanism

  • Contact pins always penetrate vertically into the profile cable to guarantee optimal contact
  • Optimal contact provided by:
    • Vertical contacting
    • 4 pins per cable and 2 pins per conductor
  • The upper section can be connected in captive fashion with the substructure module thanks to the mounting mechanism
  • Upper section is freely rotatable and removable
  • The new mounting mechanism prevents damage to the profile cable

Passive distributor optional with integrated fuse

Passive distributor ASi/AUX to M12

Cable protection against short circuits

  • Optional with integrated fuse, either with 4 × 4 A replaceable fuse or with 4 × 1 A self-resetting fuse
  • Additional protection for connected devices
  • Reliable protection against short circuits


Special assemblies on request

Power distribution

Comparison between ASi Installation and other IP67 fieldbus systems

Other fieldbus systems

  • Mostly line structure
  • No stub cables Any stub
  • Shielded, twisted cables (exception: IO-Link)
  • Data and power separate (for IO-Link partially in the same round cable)
  • Installation only via plug/socket
  • Many cables of various lengths usually needed
  • Coarser granularity, generally at least 8 in-/outputs per module
  • 24 Volt power distribution: M12 (Ø < 0.4 mm²) usually with many fuses and single leads from the control cabinet or through ¾ inch plugs
  • No special power supply needed


  • Any structure: line, star or mixed
  • Any stub cables
  • Unshielded, non-twisted cable
  • Data and power on the same cable
  • Installation using flat cable, M12 plugs or mixed
  • Simply cut flat cable to the required length from the spool
  • Fine granularity: Modules with 1, 2, 4, 8, 16 I/Os available; the more modules or the finer the granularity, the greater the cost advantage when using penetration technology
  • 24 Volt power distribution: With centralized feeding over black flat cable (Ø 1.5/2.5 mm²); if needed, passive distributors in IP67 for changing to round cable with smaller conductor cross-section are available
  • Up to 50 m cable length no special power supply needed (24V ASi)

24 Volt ASi

ASi with 24 V standard power supply

ASi with 30 V power supply

U = R × I
Voltage = Resistance × Current


The longer the ASi cable , the greater the resistance. This means for 24 Volt ASi that a cable length of 50 meters should not be exceeded, since otherwise the voltage could drop too much.

Save time and money

Save time

The simple and clear assembly means less documentation and installation time.


Save money

With this installation technology you also eliminate plugs, end caps, tees, pre-assembled cables and many fuses.

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