Digitronic
Digital Cam Switch Unit
Automationsanlagen GmbH
CamCon DC33/X with 8 programs
4.2. The encoder
The encoder is used for getting the actual position, necessary for the cam controller. Only encoders
with an SSI interface can be connected to CamCon DC33/X. The SSI interface is a common interface
for absolute single and multiturn encoders. The CamCon supplies the measuring system with 24Volt
via this interface. To read the data, CamCon sends a clock signal with an RS422 level to the encoder.
The encoder the answers synchronously with the output (data) of the position in Gray code. The
frequency of the clock signal depends on the length of the cable connecting ecoder and CamCon. The
cable length can be maximum of 200 metre.
Note:
The data protocol corresponds with the Stegmann SSI Norm.
Tp
= clock impulse
Tmono
= mono flop time 25µs
Attention:
Use only a covered double entwired connection cable. The
wiring should not be near power current lines. Ground the
covers at both sides.
4.3. The outputs
CamCon is equipped with either 8 or 16 short circuit-proof outputs, depending on the version. They
emmit 24V high active signals and are not potentially free. They supply up to 500mA permanent
current in a surrounding temperature of 25°C. If an output short circuits or overloads, the device
switches off with the
"A-Err"
message.
Attention:
With inductive loads the outputs have to be switched with free wheeling
diodes.
4.4. External program selection
The CamCon offers the possibility to select the desired program number externally, through special
outputs. To do this you have to enter the program number as a binary digit at the pins for the external
program selection (pins 28, 29 and 30). With an inpulse (+24V), that has to be entered at least 20ms
after the program number and that has to be at least 20ms long, the program is selected at the input
for the program number transfer (pin 31).
4.5. External activation of the keyboard lock
A signal (+24V DC) at the input for the activation of the keyboard lock (pin 32) disables the keys
and
. This makes it impossible to initialize or program the device.
4.6. Precautions to be taken at welding operations
For the duration of welding operations carried out at the machine, the connecting wires concerning the
data exchange from the measuring system to the CamCon and the power supply as well as the
grounding connections and inputs and outputs have to be separated from the CamCon.
Version from: 18.06.2009
Page: 12
