BURKERT 20042555 Type 8647 AirLINE SP is an 8-slot electro-pneumatic valve island engineered for direct integration into the Siemens SIMATIC ET 200SP distributed I/O system. Built in an 11 mm width-per-station configuration with Revision 2 (REV.2) architecture, the unit features an AirLINE Quick stainless steel cabinet floor mounting plate, mixed valve population flexibility, bottom-facing D6 push-in working connections, and G 1/4 supply and exhaust ports. It operates within a nominal pressure span of 2.5 bar to 10.0 bar and an ambient operating temperature range of 0 °C to +55 °C.

Equipped with integrated pneumatic HotSwap functionality in supply channel 1 (P) and integrated check valves in exhaust channels 3 (R) and 5 (S), the assembly permits valve replacement under live operating pressure while preventing exhaust back pressures from triggering unintended actuator switching. The assembly carries an IP20 device rating and achieves UL Type 4X and IP65 protection in closed control cabinets via the AirLINE Quick interface.

System Integration with Siemens SIMATIC ET 200SP

Type 8647 AirLINE SP connects directly to the backplane bus and power bus of the Siemens SIMATIC ET 200SP automation system without intermediate wiring. Electrical load voltage (24 V DC ±10% SELV/PELV) and internal communication are supplied through adjacent SIMATIC ET 200SP BaseUnits. Configuration occurs in Siemens TIA Portal (version 13 or higher), STEP 7 Classic (version 5.5 SP4 or higher), or third-party engineering environments via GSDML and HSP.

• Bus Communication: Centralized control via PROFINET or PROFIBUS DP interface modules (e.g., IM 155-6 PN ST, IM 155-6 PN HF, IM 155-6 DP HF).
• Energy Management: Electronic base modules support PROFIenergy commands to transition valve coils into coordinated pause states during machine idle intervals.
• Electronic Base Modules: Visual channel status is provided directly on integrated graphic LCDs and module LEDs (PWR and DIAG).

AirLINE Quick System Compatibility

AirLINE Quick control cabinet base adaptation cannot be combined with SIMATIC ET 200SP HA due to mechanical enclosure constraints. For ET 200SP installations, standard DIN rail projection must not exceed 10 cm on either side of the valve block, and only short BaseUnits may be used.

Revision 2 (REV.2) Design and Valve Compatibility

Article 20042555 incorporates Bürkert Revision 2 (REV.2) pneumatic components. In REV.2, fluidic interfaces between single valves, double valves, and the pneumatic base modules are standardized under the FM20 flange profile.

Distinguishing Feature	Revision 1 (REV.1)	Revision 2 (REV.2 - 20042555)
Release Ring Color	Black	Blue
Working Port Channel Geometry	Parallel linear alignment	Wavy offset alignment
Type Label Revision Marking	Unmarked (no Rev. text)	Marked with "Rev.2"
Valve Flange Interface	Dissimilar (FM14 single / FM20 double)	Unified FM20 flange standard
HotSwap Flow Reduction	Up to 50% flow reduction	Approximately 20% flow reduction

Single Valve Mechanical Interchangeability

Single pilot valves from REV.1 and REV.2 are not mechanically interchangeable on the pneumatic sub-base due to differing port cross-sections and flange geometries. Replace REV.2 valve slots only with REV.2 designated spare valves.

AirLINE Quick Stainless Steel Floor Mounting

AirLINE Quick allows bottom mounting of the valve block directly into a cutout on the floor of the control cabinet. The stainless steel adapter plate seals the enclosure, and all pneumatic working lines (D6) route downward outside the cabinet interior. This layout physically separates electronic I/O hardware from pneumatic piping.

AirLINE Quick Installation Steps

1. Prepare a burr-free cutout in the cabinet floor according to the AirLINE Quick dimension specification.
2. Verify the elastomeric seal is seated without twisting in the groove of the stainless steel AirLINE Quick plate.
3. Position the valve block from inside the cabinet over the base cutout.
4. Attach the stability plate from the outside and secure with M5x10 screws tightened to 2.0 Nm.
5. Verify that the standard DIN rail is grounded with low impedance to ensure EMC compliance.

Pneumatic Ports, P-Shutoff HotSwap, and Check Valves

Connection units handle bulk media supply and deaeration, while individual pneumatic base modules route air to the actuators through bottom-oriented D6 push-in connectors.

Port Identification	Marking	Port Size / Type	Functional Assignment
Port 1	P/1	G 1/4	Compressed air supply (2.5 to 10.0 bar)
Port 3 / 5	R/3, S/5	G 1/4	Exhaust air deaeration channels
Port X	X	M5	Auxiliary pilot air or pilot exhaust
Working Ports	2, 4	D6 Push-in	Actuator supply (bottom pneumatic base)

Working Port Porting Configurations

• 3/2-Way Single Valve (Type 6524): Upper port remains inactive; working pressure outputs through lower connection 2.
• 2x3/2-Way Double Valve (Type 6524): Upper connection acts as port 2; lower connection acts as port 4.
• 5/2-Way Valve (Type 6525): Upper connection acts as port 2; lower connection acts as port 4.

HotSwap and Exhaust Back Pressure Protection

Pneumatic HotSwap enables individual pilot valves to be loosened and replaced while supply line 1 (P) remains pressurized. An automatic shutoff valve closes the P gallery at the valve seat, allowing brief localized exhaust before sealing. Integrated check valves in ports 3 and 5 prevent pressure pulses in common exhaust lines from back-feeding into inactive pneumatic actuators.

Thread Tightening Torques

Connection Thread	Function	Recommended Torque	Maximum Torque
G 1/4	P supply, R/S exhaust	4.0 Nm to 7.0 Nm	20.0 Nm
M5	Auxiliary pilot air (X)	1.0 Nm to 1.2 Nm	3.0 Nm
M7	Push-in cartridge fitting	1.75 Nm to 2.25 Nm	4.0 Nm
M5x10	AirLINE Quick stability plate	2.0 Nm	2.0 Nm

Electrical Architecture, Load Voltage, and Diagnostics

Type 8647 receives control commands via the backplane bus and draws coil power from the 24 V DC power bus. A light-colored BaseUnit (BU...D or BU...D/T) placed directly to the left splits the load voltage potential group.

• Load Voltage: 24 V DC (±10% permissible tolerance), SELV/PELV certified.
• Power Consumption: 0.8 W per pilot valve coil (Type 6524/6525 monostable); 2 x 0.8 W for 2x3/2-way variants.
• Circuit Protection: Each valve output is safeguarded by resettable semiconductor fuses. Module electronics and connection units contain blow fuses.
• Under-Voltage Interlock: If load voltage falls below 21.6 V (24 V - 10%), the PWR OK LED on the PSU-L module turns off, PQ modules trigger a "No supply voltage" diagnostic, and valve coils are de-energized to prevent undefined switching.
• Switching Cycle Monitoring: Remanent internal cycle counters log operations independently for pilot solenoids and connected actuators to schedule preventive maintenance.

Pneumatic Hose Installation and Push-in Connector Requirements

Push-in connections comply with ISO 14743:2020. Tubing cuts must be straight (90°) and free of burrs or scratches to ensure airtight clamping.

Tubing Material	Outside Diameter (OD)	Permissible OD Deviation	Minimum Tensile Holding Force
Polyamide (PA)	6.0 mm (D6)	±0.08 mm	120 N
Polyurethane (PU)	6.0 mm (D6)	±0.10 mm	100 N

For flexible polyurethane (PU) tubing operating at elevated pressures or vibrations, support sleeves (ID 20099400) should be inserted into tube ends to maintain concentricity and retention force.

Technical Specifications

Parameter	Technical Specification
Model Designation	Valve block AirLINE SP Type 8647
Order Code (Article Number)	20042555
Station Pitch / Width	11 mm per valve position
Total Valve Capacity	8 valve slots (08-bank)
Valve Population Type	Mixed valve population
Operating Pressure Span	2.5 bar to 10.0 bar (vacuum-capable options with auxiliary air)
Control Medium	Neutral gases, dry compressed air oiled or unoiled (ISO 8573-1:2010, Class 7.4.4, max. particle size 5 µm)
Flow Rate (QnN)	300 l/min nominal (approx. 240 l/min with REV.2 HotSwap P-shutoff)
Medium Temperature	0 °C to +50 °C
Operating Ambient Temperature	0 °C to +55 °C
Storage Temperature	-20 °C to +60 °C
Relative Humidity	75% average, 85% occasional (non-condensing)
Operating Altitude	Up to 2000 m above sea level
Housing Materials	PA, PC (Valves: PA / PPS / Aluminium; Seals: NBR)
Flange Plate Material	Stainless steel (AirLINE Quick)
Protection Class	Class 3 (DIN EN 61140 / VDE 0140) with FE functional ground