BURKERT 20120869 Type 8647 AirLINE SP is a modular electropneumatic automation system engineered for direct integration into Siemens SIMATIC ET 200SP and SIMATIC ET 200SP HA distributed I/O systems. Configured as a 24-station valve block with an 11 mm station pitch, this unit incorporates 24 double pilot valves providing 48 independent 3/2-way normally closed (circuit function C) pneumatic channels. Operating across a pressure span of 2.5 bar to 10 bar, it features pneumatic HotSwap on port 1 (P), integrated non-return check valves on exhaust ducts 3 (R) and 5 (S), and an integrated electronic pressure sensor on the supply unit.

Built to Revision 2 (REV.2) manufacturing standards, the island uses a unified FM20 pneumatic flange pattern, blue push-in release rings, and an optimized internal flow architecture. The system mounts directly on a standard DIN rail inside control cabinets, providing IP20 protection individually and achieving IP65 integrity within closed enclosures.

System Architecture and Module Composition

Type 8647 consists of connection units, pneumatic base modules, electronic base modules (PQ modules), and integrated solenoid pilot valves. Supply air and deaeration occur through specialized pneumatic supply units (PSU):

• Left Connection Unit (PSU-L-PS): Anchors the block to the standard DIN rail, interfaces with the Siemens ET 200SP backplane bus, and contains an electronic pressure sensor with LED status indicators.
• Intermediate Feed Unit (PSU-M): Installed centrally along the valve row. For 2x 3/2-way valves, Burkert specifications mandate an additional intermediate air supply after every 16 valve functions to prevent pressure drops during concurrent actuation. SKU 20120869 incorporates 1 intermediate feed unit.
• Right Connection Unit (PSU-R): Terminates the pneumatic supply channels and secures the mechanical block assembly to the DIN rail.

The 24 valve stations are assembled from electronic PQ modules and corresponding pneumatic base modules. The pneumatic modules house the D6 push-in connectors in a wavy channel arrangement characteristic of REV.2, delivering working air downward through the module base.

Technical Specifications

Feature	Specification Details
Article Number	20120869
System Type	Type 8647 AirLINE SP
Hardware Generation	Revision 2 (REV.2)
Number of Valve Stations	24 stations (48 valve channels)
Valve Configuration	24x Type 6524 2x 3/2-way normally closed (CF C)
Station Pitch	11 mm
Operating Pressure Range	2.5 bar to 10.0 bar (gauge pressure)
Nominal Air Flow Rate ($Q_{Nn}$)	300 l/min (reduced by approx. 20% with integrated P-shutoff)
Fluid Medium	Compressed dry air (lubricated or unlubricated), neutral gases (ISO 8573-1:2010 Class 7.4.4, 5 µm filtration recommended)
Medium Temperature	0 °C to +50 °C
Ambient Operating Temperature	0 °C to +55 °C
Supply / Exhaust Ports (1/P, 3/R, 5/S)	G 1/4 female thread
Working Connections (2/A, 4/B)	Push-in coupling D6 mm (bottom orientation)
Operating Voltage	24 V DC (±10% allowable tolerance, residual ripple 2.4 Vss)
Power Consumption per Double Valve	2x 0.8 W (with electronic power reduction)
Nominal Current per Valve Position	40 mA peak (28 mA holding current after 120 ms)
Operating Mode	100% continuous operation (100% ED)
Degree of Protection	IP20 (IP65 in closed control cabinet)
Protection Class	Class III according to DIN EN 61140 / VDE 0140
Integrated Check Valves	Factory fitted in exhaust ports 3 (R) and 5 (S)
Pneumatic HotSwap	Integrated P-shutoff check valve in port 1 (P)

Integrated Pressure Monitoring and Diagnostics

SKU 20120869 integrates an electronic pressure sensor within the left connection unit (PSU-L-PS). The sensor continuously tracks system line pressure across a 0 to 10 bar relative span with a precision of 0.2 bar and a measurement cycle exceeding 10 readings per second. It withstands overload pressures up to 14 bar without loss of calibration.

Diagnostic and status information is displayed through module-level LEDs and graphic LC displays on each electronic PQ module:

• PWR OK / PWR LEDs: Confirm the presence of adequate 24 V DC supply voltage across connection and valve units.
• DIAG LEDs: Signal module status, unparameterized states (flashing green), or active diagnostics (flashing red).
• Pressure LEDs: Illuminate green for normal operating pressure, yellow/orange upon undercutting or exceeding configured warning thresholds, and red upon breaching error limits.
• Graphic LC Display: Shows real-time valve actuation states, numeric pressure readings, position feedback, and alternating alphanumeric fault text (such as wire break, short circuit, or maintenance limits).
• Independent Cycle Counters: Each channel tracks operations separately for the pilot valve and the field actuator. Warning thresholds can be parameterized to trigger preventive maintenance notices.

Diagnostic Reporting via Bus

Diagnostic messages such as wire break and short circuit are evaluated per channel when the respective channel is enabled. If supply voltage drops below the 21.6 V DC low threshold, the system triggers a "No supply voltage L+" diagnostic and turns off the valve coils to avoid undefined mechanical states.

Siemens SIMATIC Integration

Type 8647 connects to the backplane bus of Siemens SIMATIC ET 200SP and ET 200SP HA interface modules without external communication cabling. The PLC exchanges cyclic I/O data, module parameters, and detailed channel diagnostics over PROFINET IO or PROFIBUS DP.

Integration Aspect	SIMATIC ET 200SP	SIMATIC ET 200SP HA
PROFINET Configuration	GSDML file / HSP	GSDML file / HUP
PROFIBUS Configuration	GSD file / HSP	Not supported
TIA Portal Software	V14 SP1 or higher (via HSP0225)	Not applicable
SIMATIC STEP 7 Classic	V5.5 SP4 or higher (via HSP2105)	Not applicable
PCS 7 Integration	V9.0 SP2 or higher (via HUP)	V9.0 SP2 or higher (via HUP)
Upstream BaseUnit Requirement	Light-colored BaseUnit (BU...D) recommended	Light-colored BaseUnit (BU...D) mandatory
Modules to the Right of Valve Block	Supported (requires new light BU)	Not supported (valve block at right end)
Maximum Stations per Valve Island	Multiple valve blocks allowed	Exactly 1 valve block per station

Safety Shutdown with Siemens F-PM-E

Type 8647 REV.2 modules marked "FC" are compatible with the Siemens F-PM-E 24VDC/8A PPM ST fail-safe power module. When de-energized by the F-PM-E module, Type 6524 pilot valves return safely to their rest position. Configure the F-PM-E dark test readback time between 1.5 ms and 2.5 ms, and the switch-on test readback time to 0.8 ms to prevent false trips.

Pneumatic and Electrical Installation

Mount the valve block horizontally or vertically on a standard DIN rail (TH 35-7.5 or TH 35-15) inside an IP54 or higher industrial enclosure. Ensure a minimum clearance of 5 cm between the upper edge of the valve block and the cabinet ceiling (8 cm if external valve shutdown EVS modules are present) to facilitate heat dissipation and screwdriver access.

Pneumatic Ports and Piping

• Port 1 (P): Primary pressure supply, G 1/4 female thread. Tightening torque: 4 Nm to 7 Nm (maximum 20 Nm).
• Ports 3 (R) and 5 (S): Common exhaust ducts, G 1/4 female thread. Equip with suitably sized exhaust silencers or exhaust piping to prevent backpressure.
• Ports 2 (A) and 4 (B): Working connections delivered via D6 push-in couplings on the pneumatic base. In 2x 3/2-way double valves, upper connection 1 acts as port 2, while lower connection 2 acts as port 4.

Push-in connections adhere to ISO 14743:2020. Tubing must be cut straight and pushed firmly beyond the stainless steel holding claws. Minimum retention forces are 120 N for polyamide (PA) tubing and 100 N for polyurethane (PU) tubing.

Maintenance, HotSwap, and Replacement Parts

SKU 20120869 includes integrated P-shutoff valves beneath each valve position. This pneumatic HotSwap mechanism permits the replacement of individual pilot valves while the island remains under line pressure (up to 10 bar). When removing a valve, air vents briefly until the shutoff mechanism seats automatically, allowing all other 23 stations to continue uninterrupted operation.

Maintenance Safety Instructions

Removing a valve on a base module with P-shutoff depressurizes working ports 2 and 4 for that specific station, which may cause connected actuators to move unexpectedly. Mechanically secure all connected actuators before loosening valve fastening screws.

Compatible Replacement Valves and Accessories

Item Description	Part Number	Scope and Notes
Replacement Valve Type 6524 (2x 3/2-way CF C with manual override)	300817	24 V DC, 2.5-10 bar, standardized FM20 flange interface for REV.2
Replacement Valve Type 6524 (2x 3/2-way CF C without manual override)	300818	24 V DC, 2.5-10 bar, used for safety shut-off channels
Blanking Cover Plate	661092	Covers unused pneumatic slots on REV.2 base modules
Electrical Connection Plug Cover	653670	Covers unused valve electrical sockets on PQ modules
Replacement Valve Seal Set FM20	20016305	Pack of 12 molded seals for Type 6524 double valves
Module Base Seal Set MP16	20024339	Pack of 4 pneumatic base-to-base seals for REV.2
Brass Push-in Connector D6	20024340	Pack of 8 push-in cartridges for 6 mm OD tubing
Stainless Steel Push-in Connector D6	20024341	Pack of 8 push-in cartridges in stainless steel 1.4401