BECKHOFF BC2000 - Manual (Page 12)

Basic Principles
11 BC2000
Insulation testing
PE power contacts inserted into the terminal without any force. The terminal closes
automatically when the pressure is released, holding the wire securely and
permanently.
The connection between the bus terminal controller and the bus terminals
is automatically realised by pushing the components together. The transfer
of the data and the supply voltage for the intelligent electronics in the bus
terminals is performed by the terminal bus. The supply of the field
electronics is performed through the power contacts. Plugging together the
power contacts creates a supply rail. Since some bus terminals (e.g.
analogue bus terminals or 4-channel digital bus terminals) are not looped
through these power contacts (or not completely) the bus terminal contact
assignments must be considered. The potential feed terminals interrupt the
power contacts, and represent the start of a new supply rail. The bus
terminal controller can also be made use of to feed the power contacts.
The power contact labelled “PE” can be used as a protective earth. For
safety reasons this contact mates first when plugging together, and can
ground short-circuit currents of up to 125 A. It should be noted that, for
reasons of electromagnetic compatibility, the PE contacts are
capacitatively coupled to the mounting rail. This can both lead to
misleading results and to damaging the terminal during insulation testing
(e.g. breakdown of the insulation from a 230 V power consuming device to
the PE conductor). The PE conductor to the bus terminal controller must be
disconnected for the insulation testing. In order to uncouple further feed
locations for the purposes of testing, the feed terminals can be pulled at
least 10 mm out from the connected group of other terminals. In that case,
the PE conductors do not have to be disconnected.
The “PE” power contact must not be used for other potentials.
Technical data BC 2000
Number of bus terminals 64
Digital peripheral signals 256 inputs and outputs
Analogue peripheral signals 128 inputs and outputs
Peripheral bytes
512 inputs and 512 outputs
Fieldbus medium Z1100 optical fibre
Plug connector Z1000 for Z1100
Baud rate 2.5 Mbaud
Electrical power supply 24 V (- 15% / +20%) EN 61131
Input current 70 mA + (total terminal bus current)/4
500 mA max.
Power-on surge 2.5 x steady operating current
Terminal bus output current 1750 mA max.
Voltage
of the power
contact
24 V DC / AC
Power contacts current
drawn
10 A
Voltage stability 500 Veff (power contact / supply voltage)
Typical weight 170 g
Operating temperature 0°C ... +55°C
Storage temperature -25°C ... +85°C
Relative humidity 95% without dew formation
Vibration/shock stability according to IEC 68-2-6 / IEC 68-2-27
EMC immunity, burst / ESD according to EN 61000-4-4 / EN 61000-4-2, limit values in accordance with
EN 50082-2
Installation location arbitrary
Protection class IP20