VLM60 User Manual
Operating notes
page 8
ASTECH GmbH
Figure 8: Pulse sequence of the encoder interface
Switching in- and output (Connection 1, Pin 5 and 6)
The
switching input
(trigger input) can be used to perform accurate internal length measurements
1
. The
permissible voltage range of the externally applied switching signal is 0...7 V (LOW) or 10...30 V (HIGH). The
switching input is opto-isolated and has a maximum current consumption of 3 mA.
The behavior of the
switching output
can be programmed via a parameter. By default, the output switches when
a serious error is present in the device. Other functions are possible. The output is a transistor output, short-
circuit proof, supplies a maximum of 100 mA and has a HIGH level of U
S
-1 V. A load resistor must be connected
to GND, e.g. 1.2 kOhm for a current of 20 mA at 24 V supply voltage.
Fieldbus interface (Connection 2)
The VLM60 optionally can be equipped with an additional fieldbus interface. This is done ex works. For
subsequent installation, the device must be sent to the manufacturer. An additional board is installed inside the
device and a device flange at connection 2. Three Ethernet-based interfaces are available for selection:
•
Ethernet (UDP, TCP),
•
Profinet IO,
•
Ethernet/IP.
Information such as data structure or update time of the individual interfaces can be found in chapter 3.
Programming interface (Connection 3)
With the help of the USB programming interface, the VLM60 can be parameterized via a computer. Furthermore,
the interface can be used for data recording or for a firmware update.
The signals '5V' (V
Bus
), 'D-', 'D+' and 'GND' are used. The USB interface is an internal RS-232 interface. The VLM60
contains an integrated circuit (FT230X) from Future Technology Devices International (FTDI). This circuit provides
a virtual serial interface (Virtual COM-Port) on the PC. The operation is the same as with a normal RS232 port. To
ensure this functionality, a driver must be installed on a Windows PC. This driver can be found on the USB stick,
1
Within the measurement accuracy specified in the technical data.