24 V DC output / pin 7:
Inputs 2 to 6 are activated if they are connected to pin 7 (active high) with +24
VDC. They can also be activated via an external SPS. The functions are deactivated by "SPS high lev-
el" and by "SPS low level".
● PLC High level: +13 V to +33 V
● PLC Low level: -33 V to +7 V
● Ri: 7 kΩ
● I
max
< 200 mA
6.1.2 Inputs
The digital inputs switch various electronic drive unit functions. Inputs are assigned with functions ex-
factory. You can configure them via the RS-485 interface and the Pfeiffer Vacuum parameter set.
DI remote priority/pin 2
V+:
The "remote" connection has control priority over all other control sources.
open:
Remote priority "inactive"
DI1 (rotation speed setting mode)/pin 3
V+:
Rotation speed setting mode "active"
open:
Rotation speed setting mode "inactive"
DI pumping station/pin 5
V+:
Vacuum pump on.
Control of all components connected and malfunction acknowledgement.
open:
Vacuum pump off
DI stand-by / pin 6
V+:
Stand-by activated
The stand-by speed can be selected in the range
30 to 100%
of the nominal speed.
GND/
open:
Stand-by off
6.1.3 Outputs
The digital outputs have a maximum load limit of 24 V/50 mA per output. All outputs listed are configura-
ble with the Pfeiffer Vacuum parameter set via the RS-485 interface (description relates to factory set-
tings).
DO1/Pin 8
V+:
No errors
After applying the voltage supply, the digital output DO1 permanently outputs V+ meaning
which means "no error".
GND
Error
"Active low" signifies "Error" (common error message).
DO2/Pin 9
V+:
Vacuum pump on
"Active high" means ''Vacuum pump on'' and rotates at set rotation speed.
Example: Use the signal for the message vacuum pump "Ready for operation".
GND:
Vacuum pump off
6.1.4 RS-485
Pin 13 and pin 14
You can connect a Pfeiffer Vacuum display and control unit (DCU or HPU) or an external PC via pin 13
and pin 14 on the D-sub connection of the electronic drive unit.
Interfaces
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