Burkert 8681, Operating Instructions Manual, Page: 81 / 166

81
IO-Link - Design
Power/current consumption for port class B:
Power 1: Electronics supply (1) + display LED
Power 2: Electronics supply (2) + actuators (solenoid valves in the control head)
Power 1:
Power consumption of the electronics (1):
P
el 1
= 1.0 W or I
el 1
= 42 mA at 24 V
Power consumption of an optical position feedback:
P
LED
= 0.5 W or I
LED
= 21 mA at 24 V
Power 2:
Power consumption of the electronics (2):
P
el 2
= 0.22 W or I
el 2
= 9 mA at 24 V
Power consumption of a valve during activation (200 ms):
P
valve ON
= 0.9 W or I
valve ON
= 38 mA at 24 V
Power consumption of a valve after reduction:
P
valve
= 0.6 W or I
valve
= 25 mA at 24 V
Calculation examples (for port class B):
Example 1:
3 valves are activated, one position is reported (status for 200 ms): the control head automatically
switches one valve after another to keep current consumption low, i.e for
Power 1: max. current consumption I
Power 1
= current consumption of electronics (1) + display LED
Power 2: max. current consumption I
Power 2
= current consumption of electronics (2) + of 2 valves (already
turned on)
+ 1 valve (currently switching)
P
Power 1
= P
el 1
+ 1 x P
LED
P
Power 2
= P
el 2
+ 2 x P
valve
+ 1 x P
valve ON
1.5 W = 1.0 W + 1 x 0.5 W 2.3 W = 0.22 W + 2 x 0.6 W + 1 x 0.9 W
or
I
Power 1
@ 24 V = I
el 1
+ 1 x I
LED
I
Power 2
@ 24 V = I
el 2
+ 2 x I
valve
+ 1 x I
valve ON
63 mA = 42 mA + 1 x 21 mA 97 mA = 9 mA + 2 x 25 mA + 1 x 38 mA
Example 2:
3 valves have been activated, one position is reported (persistent state):
P
Power 1
= P
el 1
+ 1 x P
LED
P
Power 2
= P
el 2
+ 3 x P
valve
1.5 W = 1.0 W + 1 x 0.5 W 2.02 W = 0.22 W + 3 x 0.6 W
or
I
Power 1
@ 24 V = I
el 1
+ 1 x I
LED
I
Power 2
@ 24 V = I
el 2
+ 3 x I
valve
63 mA = 42 mA + 1 x 21 mA 84 mA = 9 mA + 3 x 25 mA
When using an external proximity switch, its power requirement should be added.
english
Control Head Type 8681