ProfiHub-A5-TechDoc
12Pages

Title slide ProfiHub A5 5 Channel DP Spur Repeater

Intelligent Internal Backbone Main Bus ! The PROFIBUS protocol is completely transparent to/from all the channels and the Main bus. This means the ProfiHub does NOT require an address! ! Every channel, including the Main bus, is galvanically isolated. ! Every channel, including the Main bus, can handle a maximum of 31 devices (bus loads). ! Termination is integrated and switchable for every channel and Main bus. Power supply Main bus In Main bus Out Channel 1 to 5 ! Main Bus-In and -Out are physically connected. 2

Baudrate Switch (default = autodetect) Intelligent Internal Backbone isolated area isolated area isolated area isolated area isolated area isolated area A, B = PROFIBUS DP Sh = Direct grounding I = Capacitive grounding T = Termination (default = ON) Tm = Termination (default = OFF)

Application 1 – ‘Dynamic Spur Lines’ Lines’ Long spur lines to instruments and the possibility to remove/insert them during operation. Short circuit protection on each spur line is automatically provided. Each spur line can be 200 m at 1,5 Mbps. Wiring problems do not spread to the other spur lines.

Application 2 – ‘Star and Tree Networks’ Networks’ Large networks with star and tree structures. This can be a combination between inside and outside applications or dirty/dusty environments. ! There is no limit in the cascading of ProfiHubs. ! Structures like these make it easy to extend the cable during operation.

Application 3 – ‘Barrier for non certified or EMC sensitive devices’ devices’ Because of the isolation and intelligence the ProfiHub provides, it can be used as a barrier for electrical sensitive segments. This keeps the backbone and other channels clean. Clean signal Noisy signal

Advanced bus interface – Cable length Baudrate (kbit/s) Segment length (feet) Example: 1000 m cable per channel at 187,5 kbps Maximum 31 devices Other channels With the same Cable length

Advanced bus interface – Recommended cable specifications We recommend to use PROFIBUS cable that complies with the following specifications: Parameter Loop resistance Wire diameter Wire area The lower the shielding resistance, the better the EMC quality. 8

Advanced bus interface – Capacity Lower bus capacity The bus capacity has been reduced to a maximum of 10 pF, versus the 15-25 pF of standard PROFIBUS equipment. Rise- and Fall times with standard PROFIBUS Rise- and Fall times with ProfiHub Lower bus capacity makes the cabling more reliable and reduces reflections when cables wear off.

Advanced bus interface – Signal amplitude Higher signal amplitude The minimal signal amplitude at a load of 54 Ohms has been increased to 2,1 V (with standard PROFIBUS this is 1,5 V). +2,1 V +1,5 V 0V Higher amplitudes create a better behaviour at heavy bus loads.

Advanced bus interface – Cable types The ProfiHub accepts all PROFIBUS cables that are available for special areas (with a maximum diameter of 12 mm). ! Robust Cable ! Food Cable ! Underground Cable ! Trailing Cable ! Festoon Cable ! FRNC Cable ! Flexible Cable ! Shipboard Cable ! Hybrid Cable Robust cable Hybrid cable Trailing cable Food cable Festoon cable Flexible cable Shipboard cable FRNC cable

ProfiHub Features Summary " 5 Galvanic isolated channels (repeater segments). " Transparent for all PROFIBUS DP protocols. " DP - RS 485 specifications for each channel. " 9,6 Kbps to 12 Mbps (automatic detection). " 31 devices per channel. " 1.200 m spur line length. " No limit in serial placement or cascading. " No address is required. " Integrated termination facilities (switches). " Configurable grounding system. " IP 65 classification (according to DIN 40 050). 12