Festo OVEM LK Series, Operating Instructions Manual

Page: 50 / 88

OVEM-…-LK
50 Festo – OVEM-…-LK – 1602NH English
Functions:
– Control of the compressed air supply with 2 valve functions (
è
Chapter 3.3).
– Auto-Drop function: generation of an automatic eject pulse for accelerated vacuum purging and
safe set-down (
è
Chapter 3.3).
– Air-saving function (
è
Chapter 3.4).
– Electrical and mechanical manual override (
è
Chapter 7.1).
– Monitoring of vacuum build-up through integrated pressure sensor. If the setpoint value is reached,
or if it is not reached due to malfunctions (e.g. leakage, dropped workpiece), the vacuum generator
emits an electrical signal and a status message.
– Prevention of vacuum purging through internal check valve if vacuum generation is interrupted.
– Data storage and expanded monitoring function.
3.2 Switching functions
The binary outputs can be configured via the switching functions. The switching status information is
thereby made available at the electric port as a process value or binary signal.
– IO-Link mode: 3 BDC (binary data channels), bit 0: BDC1 or BDC2, bit 1: BDC3 (
è
Chapter 4.3).
– SIO mode: 2 switching outputs Out A and Out B.
The switching logic of the binary outputs can be configured as normally open (NO) or normally closed (NC).
The switching mode of the binary outputs can be determined as threshold value or window comparator.
Threshold value comparator Normally open (NO) Normally closed (NC)
Switching function
– 1 Switchpoint (SP1)
Teach mode
1)
:
– 2 Teach-in points
(TP1, TP2)
– SP1 = ½ (TP1+TP2)
p
1
0
HY
OUT
SP1
TP1 TP2
p
1
0
SP1
HY
OUT
TP1 TP2
1) TP1 = smaller pressure value, TP2= larger pressure value, independent of the Teach sequence
Tab. 2 Threshold value comparator: setting of switchpoint SP1 and hysteresis HY
Window comparator Normally open (NO) Normally closed (NC)
Switching function:
– 2 switchpoints
(SP1, SP2)
Teach mode
1)
:
– 2 Teach-in points
(TP1, TP2)
TP1=SP1
HY HY
p
1
0
OUT
TP2=SP2
TP1=SP2
p
1
0
OUT
HY
HY
TP2=SP2
1) TP1 = smaller value, TP2 = larger value, independent of the Teach sequence
Tab. 3 Window comparator: setting of switchpoints SP1, SP2 and hysteresis HY