Benezan Electronics
Hard- and software development
NetBob2 Installation ManualEthernet CNC
Interface
Nicolas Benezan, Stauffenbergstr. 26, 72108 Rottenburg
Phone: +49 (0) 7457/946365 0 benezan-electronics.de
Page
NetBob2-Installation_Englisch (Vereinigte
Staaten).docx 23.09.2020
Connection of industrial servos
The breakout board can also be operated together with industrial servos which support a position control mode
with step/direction signals, e.g. the Speedcube controllers from Benezan Electronics or the RS1A series from
SanyoDenki. These controllers have a separate connection for motor operating voltage and internal supply or
have inputs for safe stop. This allows safe stopping of the drives in case of emergency stop or open doors. With
additional effort, a set-up mode (travel at reduced speed with open door) can also be implemented. Adapter
cables, circuit diagrams and support services for the adjustment are available on request and against payment.
Outputs
The breakout board has a total of nine outputs with 24V level (positive logic, i.e. PNP type). The outputs 1-8 can
be loaded with max. 250mA each, which is sufficient for most relays, contactors and solenoid valves. Output no.
9 can be loaded with up to 3A. If an electromagnetic holding brake is required for the Z-axis, it is recommended
to connect it to output 9.
All outputs are short-circuit proof and have protection against overvoltage peaks when switching inductive
loads. If higher voltages or higher currents are to be switched, external relays or contactors must be connected.
Switch inputs
There are a total of 16 digital inputs with 24V level (positive logic, i.e. PNP type). The first 6 are intended for
the reference switches of the 6 axes, but can also be used for other purposes.
Mechanical switches or inductive proximity switches of the PNP type can be used. The sensors should be
connected as follows: brown (+24V) to terminal 1, 3, 5 or 7, blue to the ground connection of the power supply
unit, black (signal) to terminal 2, 4, 6 or 8 The sum of the supply currents of the sensors at X3 and X4 is limited
to 150mA, those of the sensors at X5 and X6 also to 150mA. If the current consumption of the sensors is higher
(i.e. all together require more than 300mA), they must be supplied externally via the power supply unit. (This
protects the board from damage in case of short circuit)
The inputs are high-active, i.e. the signal is logic 1 when the connected switch is closed, or when a voltage
>8V is present at the input. The signal is logic 0 when the input is de-energized or the switch is open. If required,
all input signals can be inverted in the software.
The switch inputs have a Schmitt trigger function and are interference suppressed with a low-pass filter, so
that there is usually no need to fear interference even with unshielded cables. The inputs are overvoltage tolerant
up to +60V. Please note that the switch inputs are not suitable for fast signals (>1kHz) with 5V level, for
example TTL encoder signals.
Emergency stop
The breakout board has several independent functions that are used to stop the machine in case of problems:
1. An emergency stop button (mushroom/panic button) must be connected to terminals X2.5 and X2.6. If
the contact is opened, the digital outputs and the analog output are switched off. A push-button
emergency stop is indicated by the right LED (red, LED4). Additionally, an emergency stop is reported
to the PC
2. If the status output of one or more output stages reports an error or if the line of the step/direction signal
is interrupted, an error signal (drive fault) is sent to the PC. The output stage error is indicated by the
second LED from the right (red, LED3).
3. In case of missing or insufficient supply voltage, an emergency stop signal is sent to the PC, so that the
software does not continue to run uncontrolled.
4. Relay outputs and step signals are only enabled if there is a valid connection with the PC software and
the software regularly sends ready messages. If the connection is interrupted, all outputs are deactivated
after a few seconds for safety reasons.
Speed control (analog output)
In order to be able to specify the speed for a frequency converter, the breakout board has an analog output. A
voltage 0..10V proportional to the duty cycle of the PWM signal is output. Here 0% (low) corresponds to a
