BURKERT 20121017 (Type 8652) is an electropneumatic valve island engineered specifically for process automation requirements. This factory configuration combines a 20-slot pneumatic base, PROFINET S2 communication interface with system redundancy, an AirLINE Quick anodised aluminium floor adapter plate, brass push-in fittings (D10 supply and D6 working ports), and 40 integrated digital inputs distributed across five 8DI electronic modules.

Pneumatic reliability is supported by integrated check valves inside exhaust ducts 3 (R) and 5 (S), preventing accidental actuator motion caused by system backpressure peaks. An integrated pneumatic HotSwap function at supply port 1 (P) permits valve replacement under live operating pressure with a flow rate reduction of approximately 3%.

Valve Slot Configuration

Article 20121017 integrates 20 physical valve positions and one intermediate supply and exhaust feed module, populated with pilot-operated solenoid valves and blind plates:

Slot Position	Valve Function	Circuit Type	Operating State	Manual Override
Position 1	3/2-way solenoid valve	CF-C (normally closed)	Servo-controlled	Latching / spring return
Position 2	3/2-way solenoid valve	CF-C (normally closed)	Servo-controlled	Latching / spring return
Position 3	3/2-way solenoid valve	CF-C (normally closed)	Servo-controlled	Latching / spring return
Position 4	3/2-way solenoid valve	CF-C (normally closed)	Servo-controlled	Latching / spring return
Position 5	5/2-way solenoid valve	CF-H (monostable)	Servo-controlled	Latching / spring return
Position 6	5/2-way solenoid valve	CF-H (monostable)	Servo-controlled	Latching / spring return
Position 7	5/2-way solenoid valve	CF-H (monostable)	Servo-controlled	Latching / spring return
Position 8	5/2-way solenoid valve	CF-H (monostable)	Servo-controlled	Latching / spring return
Position 9	5/2-way solenoid valve	CF-H (monostable)	Servo-controlled	Latching / spring return
Position 10	5/2-way solenoid valve	CF-H (monostable)	Servo-controlled	Latching / spring return
Position 11	5/2-way solenoid valve	CF-H (monostable)	Servo-controlled	Latching / spring return
Position 12	5/2-way solenoid valve	CF-H (monostable)	Servo-controlled	Latching / spring return
Position 13	5/2-way solenoid valve	CF-H (monostable)	Servo-controlled	Latching / spring return
Position 14	5/2-way solenoid valve	CF-H (monostable)	Servo-controlled	Latching / spring return
Position 15	5/2-way solenoid valve	CF-H (monostable)	Servo-controlled	Latching / spring return
Position 16	5/2-way solenoid valve	CF-H (monostable)	Servo-controlled	Latching / spring return
Position 17	5/2-way solenoid valve	CF-H (monostable)	Servo-controlled	Latching / spring return
Position 18	Blind plate	—	Unassigned slot	—
Position 19	Blind plate	—	Unassigned slot	—
Position 20	Blind plate	—	Unassigned slot	—

Technical and Operating Specifications

Specification Parameter	Value / Characteristic
Operating medium	Oil-free or lubricated compressed dry air, neutral gases (5 µm filter recommended)
Compressed air quality	ISO 8573-1:2010, Class 7.4.4
Nominal operating pressure	-1.00 bar to 10.00 bar (vacuum to 10 bar)
Auxiliary pilot air	Internal supply, 3 bar to 10 bar
Nominal flow rate QNn (air)	310 l/min (measured at +20 °C, 6 bar inlet pressure, 1 bar pressure drop)
Flow rate with HotSwap engaged	Reduced by approx. 3 %
Switching times (ISO 12238)	CF-C: opening 15 ms, closing 15 ms; CF-H: opening 20 ms, closing 25 ms
Operating voltage	24 V DC (±10 %), residual ripple 1 Vss
Power consumption per valve	0.7 W nominal (0.175 W after internal holding power reduction)
Nominal current per valve	29 mA (10 mA after power reduction)
Operating duty cycle	Continuous operation (100 % ED)
Electrical protection class	Class III according to DIN EN 61140 / VDE 0140
Degree of protection	IP20 (bare module); IP65 in closed control cabinet via AirLINE Quick adapter
Ambient & medium temperature	-10 °C to +55 °C
Storage temperature	-20 °C to +60 °C
Housing material	Polyamide (PA)
Sealing materials	NBR and PUR
Station slice width	11 mm

AirLINE Quick Adapter Integration

The AirLINE Quick aluminium adapter plate enables direct mounting through the floor or wall cutout of a control cabinet. All pneumatic supply and working lines connect on the cabinet exterior, eliminating bulkheads and internal piping while achieving an IP65 seal against the cabinet enclosure.

Mechanical / Interface Item	Execution Detail
Adapter plate material	Anodised aluminium
Working pneumatic ports (2 & 4)	Push-in fittings D6 mm, nickel-plated brass
Supply / exhaust connections (1, 3, 5)	Push-in fittings D10 mm, nickel-plated brass
Installation location	Control cabinet floor or control cabinet wall

Dimensional Data and Control Cabinet Installation

Dimensions for the 20-fold variant with integrated intermediate supply module:

Dimension Variable	Dimension Value (mm)
A	134 mm
B	268 mm
C	10 × M5 fastening screws
D	158.3 mm
m	11
m'	7
n	5

Mounting Clearances

Maintain the prescribed minimum clearance between the valve island front edge and the control cabinet door or frame. This clearance ensures sufficient space for unlatching and withdrawing pilot valves during HotSwap servicing without dismounting the terminal.

Electrical Connections and PROFINET S2 Interface

Type 8652 utilizes separated electrical feeds for logic and valve coils. The electronics and LC display are powered via a 5-pin spring-loaded terminal block, while valve coils receive power via a separate 2-pin spring-loaded terminal block:

Terminal	Pin / Clip	Wire Colour Code	Signal Assignment
Logic Supply (5-pin)	1	Red	+24 V DC logic power
Logic Supply (5-pin)	2	White	CAN_H (büS interface)
Logic Supply (5-pin)	3	Green	Shielding
Logic Supply (5-pin)	4	Blue	CAN_L (büS interface)
Logic Supply (5-pin)	5	Black	0 V DC (GND)
Valve Power (2-pin)	1	Red	AUX +24 V DC (valves)
Valve Power (2-pin)	2	Black	0 V DC (GND)

PROFINET S2 communication connects through dual RJ45 Ethernet ports (X1 and X2), providing media and system redundancy:

RJ45 Pin	PROFINET Signal Assignment
Pin 1	TX+ (Transmit Data +)
Pin 2	TX- (Transmit Data -)
Pin 3	RX+ (Receive Data +)
Pin 4	Not connected (N.C.)
Pin 5	Not connected (N.C.)
Pin 6	RX- (Receive Data -)
Pin 7	Not connected (N.C.)
Pin 8	Not connected (N.C.)

Digital Input Modules (8DI)

Article 20121017 features 5 electronic modules with digital inputs, delivering 40 feedback channels directly over PROFINET S2. Each input channel supports standard 2-wire sensors, 3-wire sensors, and mechanical dry contacts:

Parameter	Technical Specification
Number of digital input channels	40 DI total (5 modules × 8 DI)
Supported sensor types	2-wire PNP/NPN (10–30 V), 3-wire PNP/NPN, mechanical limit switches
Switching thresholds	V_OFF = 0 V to 5 V; V_ON = 10 V to 30 V
Input current at V_ON	Max. 5.7 mA per channel (typical at 24 V DC)
Current supply per DI	Max. 30 mA per channel
Input impedance	> 4 kΩ
Diagnostic detection	Open-circuit detection with 2-wire sensors; short-circuit detection with 3-wire sensors
Galvanic isolation	None (all channels share common reference potential)
Maximum cable length	< 30 m (conductor cross-section ≤ 1.5 mm²)

Pneumatic HotSwap and Safety Functions

Each valve slot features an automatic shut-off check valve at the supply port P (1). Removing a valve for maintenance isolates pilot pressure to that station, preventing line decompression and maintaining process availability on adjacent active slots.

Hazardous Area Limitations

In potentially explosive atmospheres (ATEX Zone 2 / 22 or Class I, Div 2), hot-swapping valves and disconnecting electrical plug connections are strictly prohibited while energized, unless the atmosphere has been verified to be non-explosive by authorized personnel.

Replacement Valves and Spare Parts

Individual valve positions can be replaced using Burkert Type 6534 replacement modules:

Circuit Function	QNn (Air)	Pressure Range	Opening Time	Closing Time	Operating Voltage	Replacement Article No.
CF-C (3/2-way NC)	270 l/min	Vac to 10 bar	15 ms	15 ms	24 V DC	301374 (REF 296031)
CF-H (5/2-way mono)	290 l/min	Vac to 10 bar	20 ms	25 ms	24 V DC	301376 (REF 296033)
Blind Plate Valve	—	—	—	—	—	335779 (REF 327614)