BURKERT 20108915 (Type 8647) AirLINE SP is a modular electropneumatic automation system configured as a 48-station valve block. Designed specifically for direct integration into Siemens SIMATIC ET 200SP and SIMATIC ET 200SP HA distributed I/O systems, the assembly incorporates 48 individual 3/2-way normally closed (circuit function C) flipper solenoid pilot valves (Type 6524) on an 11 mm station pitch. It mounts directly onto standard DIN rails in control cabinets, establishing electrical connections through the ET 200SP backplane bus while operating as an integrated pneumatic slave.

This specific configuration features G 1/4 primary supply ports (P) and exhaust ports (R, S), bottom-oriented D6 mm push-in working connections, 2 intermediate supply feed modules (PSU-M), integrated pneumatic HotSwap valves in channel 1 (P), and integrated non-return check valves in channels 3 (R) and 5 (S). The assembly is certified for use in potentially explosive atmospheres categorized as Zone 2 under ATEX and IECEx (Ex ec IIC T4 Gc).

Technical Specifications

Parameter	Specification
Valve Island Type	Type 8647 AirLINE SP (Revision 2)
Article Number (MPN)	20108915
Total Valve Stations	48 stations (48x single 3/2-way pilot valves)
Circuit Function	Circuit function C (3/2-way, servo-assisted, normally closed)
Station Pitch / Width per Station	11 mm
Pneumatic Supply Connection 1 (P)	G 1/4 thread
Pneumatic Exhaust Connections 3 (R), 5 (S)	G 1/4 thread (with integrated check valves)
Pneumatic Working Ports 2 (A)	D6 mm push-in tube coupling (bottom module exit)
Operating Pressure Range	2.5 bar to 10.0 bar (overpressure to atmospheric)
Nominal Air Flow Rate ($Q_{Nn}$)	Approx. 240 l/min (base 300 l/min, reduced by ~20% with P HotSwap)
Operating Medium	Lubricated or oil-free dry compressed air, neutral gases (ISO 8573-1:2010, Class 7.4.4, 5 µm filtration recommended)
Medium Temperature Range	0 °C to +50 °C
Ambient Temperature Range	0 °C to +55 °C
Operating Voltage	24 V DC (±10%, SELV/PELV, max. 2.4 Vss ripple)
Nominal Power Consumption	0.8 W per pilot valve (inrush 40 mA, holding 28 mA after 120 ms)
Nominal Operating Mode	Continuous operation (100% duty cycle)
Switching Times (ISO 12238)	Opening: 15 ms; Closing: 28 ms
Intermediate Supply Modules	2 units (PSU-M, required after every 24 valve functions)
Explosion Protection Marking	II 3 G Ex ec IIC T4 Gc (BVS 18 ATEX E 078 X / IECEx BVS 18.0068 X)
Degree of Protection	IP20 (verified IP65 inside suitable closed control cabinet)
Communication Interface	Siemens SIMATIC ET 200SP / ET 200SP HA backplane bus (PROFINET IO / PROFIBUS DP)

System Architecture & Modular Layout

Type 8647 comprises modular pneumatic and electronic base sub-assemblies arranged between rigid connection units. Left (PSU-L) and right (PSU-R) connection units supply compressed air, vent exhaust, and anchor the block mechanically to the DIN rail.

Because fluidic guidelines require an intermediate air feed after every 24 valve functions, configuration 20108915 incorporates two central intermediate feed units (PSU-M). This segmentation maintains supply volume across all 48 working stations, preventing local pressure drops during simultaneous valve actuations.

Each valve segment consists of an electronic base module (PQ module) and a matching pneumatic base module:

• Electronic Base Modules (PQ): House internal valve drive circuitry, short-circuit and wire-break detection, illuminated visual status indicators (DIAG and PWR LEDs), and an LC display. The display presents active channel output states, feedback errors, and diagnostic messages.
• Pneumatic Base Modules: Form the pressure-retaining manifold block, containing internal channels for port 1 (P), port 3 (R), and port 5 (S), as well as push-in receptacles for working lines 2 (A).

Revision 2 (REV.2) Design Features

Configuration 20108915 is built to Revision 2 (REV.2) manufacturing standards. REV.2 includes mechanical and fluidic optimizations over earlier revisions:

• Unified Flange Profile FM20: Pilot valves Type 6524 and 6525 utilize the standardized FM20 interface across single and double valve variants. Single valves from REV.1 (FM14) and REV.2 (FM20) cannot be interchanged.
• Wavy Port Arrangement: Pneumatic working connections on REV.2 base modules are staggered in a distinct wavy pattern, distinguishing them from the parallel layout of REV.1.
• Blue Hose Release Rings: Integrated push-in collet release collars are colored blue on REV.2 units (black on REV.1).
• Reduced Pressure Drop in P-Shutoff: The integrated HotSwap check mechanism in the supply channel restricts airflow by approximately 20%, compared to a reduction of up to 50% in REV.1 modules.

Pneumatic Installation & Port Connections

Pneumatic piping must supply clean, conditioned compressed air complying with ISO 8573-1:2010 Class 7.4.4. Connections must adhere to specified torque limits:

Connection Port	Marking	Thread / Coupling Type	Recommended Torque	Maximum Torque
Main Air Supply	P / 1	G 1/4	4.0 to 7.0 Nm	20.0 Nm
Exhaust / Deaeration	R / 3, S / 5	G 1/4	4.0 to 7.0 Nm	20.0 Nm
Auxiliary Pilot Air (if used)	X	M5	1.0 to 1.2 Nm	3.0 Nm
Working Line Output	2 (A)	D6 mm push-in	Hand insertion to internal stop	—

Exhaust Ventilation and Backpressure Prevention

Never seal or throttle deaeration connections (3/R and 5/S) or pilot exhaust port X. Insufficient exhaust air cross-sections generate backpressure that can trigger unintended actuator movements. Always route exhaust lines via adequately sized silencers or collector manifolds.

Pneumatic tubing inserted into the D6 mm push-in connectors must comply with ISO 14743:2020 dimensions. Polyamide (PA) tubing with an outside diameter of 6 mm requires an outer tolerance of ±0.08 mm and a minimum retention force of 120 N. Cut all pneumatic tubing squarely before pushing firmly past the internal O-ring seal.

Electrical & Control System Integration

Type 8647 connects directly to the backplane bus of the Siemens SIMATIC ET 200SP or ET 200SP HA station. System engineering is supported through multiple configuration pathways:

• GSD / GSDML: Hardware configuration via PROFINET (GSDML) or PROFIBUS DP (GSD) device description files.
• HSP (Hardware Support Package): HSP0225 for Siemens TIA Portal (V14 SP1 or higher) and HSP2105 for SIMATIC STEP 7 V5.5.
• HUP (Hardware Update Package): PCS7 V9.0 SP2 or higher via dedicated Bürkert HUP packages.

Dedicated Power Supply Segmentation

Mount a light-colored Siemens BaseUnit (type BU...D or BU...D/T) on the standard rail immediately to the left of valve block 8647. This isolates the 24 V DC load voltage from the preceding PLC logic cards, ensuring compliance with the ±10% voltage tolerance and meeting current supply requirements.

Diagnostic messages generated by the electronic base modules include wire break, coil short circuit, load voltage loss, and switching cycle limits. The switching cycle counter monitors pilot valve cycles and actuator strokes separately via internal non-volatile memory.

Safety Shut-Off Functions & HotSwap Conditions

Configuration 20108915 incorporates two critical safety and maintenance functions:

1. Integrated Check Valves (RSV): Ports 3 (R) and 5 (S) contain check valves that prevent transient pressure surges from feeding back into de-energized cylinders during collective system exhaust or emergency shutdowns.
2. Pneumatic HotSwap (P-Shutoff): Base modules equipped with automatic P-channel shut-off allow individual Type 6524 pilot valves to be unbolted and replaced while system supply pressure remains active. An internal poppet seals the supply line automatically upon valve removal.

Operational Restrictions in Explosive Atmospheres

Pneumatic HotSwap of individual valves under line pressure must not be performed in active ATEX/IECEx Zone 2 hazardous areas. Disconnect operating pressure and de-energize the assembly before replacing valves within hazardous locations.

When implemented alongside Siemens fail-safe power modules (F-PM-E 24VDC/8A PPM ST), safety-related shut-off complies with ISO 13849-1 and IEC 62061 standards. For correct F-PM-E operation, set the maximum dark test readback time between 1.5 ms and 2.5 ms, and the switch-on test readback time to 0.8 ms.

Dimensions & Space Requirements

During cabinet layout, maintain a minimum clearance of 50 mm between the upper edge of the valve block and adjacent wire ducts or cabinet surfaces (80 mm if top EVS terminal plugs are used) to allow ventilation and screwdriver access to valve mounting screws.

Maintenance & Spare Parts Ordering

If valve replacement is required, tighten valve fastening screws alternately in diagonal pairs to 0.15 Nm:

Item	Description	Content	Article No.
Replacement Valve (no manual override)	Type 6524 3/2-way CF C, 2.5–10 bar, 24 V DC, REV.2	1 pc	20029924
Replacement Valve (with manual override)	Type 6524 3/2-way CF C, 2.5–10 bar, 24 V DC, REV.2	1 pc	20029918
Valve Seal Kit	Replacement seals FM24 for Type 6524 3/2-way REV.2	12 pcs	20024336
Module Seal Kit	Replacement module seals for Type MP16	4 pcs	20024339
Pneumatic Base Unit	4-fold, 11 mm width, D6 push-in, FM20, HotSwap, RSV	1 pc	20040335
Intermediate Feed Unit	PSU-M intermediate supply unit, 11 mm, G 1/4	1 pc	20030063
Left Interface Unit Kit	Interface module mechanical set for Type 8647	1 set	20029826
Blanking Cover Plate	Cover plate for unused valve slots (REV.2)	1 pc	661092
Push-in Connector	Spare D6 mm push-in cartridge, brass nickel-plated	8 pcs	20024340