Implementing 3-Switch XOR Ladder Logic with Internal Bit
Implement a 3-SPST switch XOR light circuit in LogixPro or RSLogix 500 using an internal relay bit. Includes truth tables, boolean equations, and verified.
Fulfilling the demand for space-saving control interfaces, the Beckhoff CP6601-0021-0020 built-in Panel PC combines an industrial-grade touch display with a reliable ARM Cortex-A8 processor to execute precise control and visualization tasks directly at the machine level. This hardware integration functions as an optimized control node, utilizing its 1 GHz processing core and Windows Embedded Compact 7 environment to run TwinCAT-based PLC automation projects with low power consumption. The mechanical design incorporates a robust aluminum front frame with a sheet-steel rear cover, engineered specifically for flush installation within control cabinets or console enclosures.
| Specification Parameter | Value / Rating |
|---|---|
| Manufacturer | Beckhoff |
| Model Number | CP6601-0021-0020 |
| Processor | ARM Cortex-A8, 1 GHz |
| Motherboard | 3.5-inch compact motherboard |
| System Memory | 1 GB DDR3 RAM |
| Persistent Memory | 128 kByte NOVRAM |
| Storage Slot | 1 x microSD slot (512 MB standard, expandable up to 16 GB) |
| Operating System | Windows Embedded Compact 7 (English) |
| TwinCAT Performance Level | TwinCAT 2: PLC level 30 / TwinCAT 3: PLC level 30 |
| Supply Voltage | 24 V DC (-15% / +20%) |
| UPS Architecture | Integrated 1-second capacitive UPS |
| Display and Touch | 5.7-inch (640 x 480) with single-finger analog resistive touch screen |
| Housing Material | Aluminum front frame with sheet-steel rear protective cover |
| Operating Temperature | 0 to 55 degC |
| Protection Rating | Front side IP65, rear side IP20 |
| Country of Origin | Germany |
| Shipping Weight (Calculated) | 5.0 kg |
| Port / Interface Label | Connector Type | Functional Assignment |
|---|---|---|
| LAN (X101) | RJ45 | 1 x 10/100BASE-T Ethernet port for network integration |
| EtherCAT (X102) | RJ45 | Real-time on-board EtherCAT master interface |
| USB 1 & USB 2 | USB Typ-A | 2 x USB 2.0 host interfaces for external input and updates |
| COM1 (X105) | D-sub 9-pin | 1 x RS232 serial interface for peripheral device communication |
| Power Input | 3-pin terminal block | 24 V DC main power connection and UPS ground reference |
The CP6601-0021-0020 serves as an optimized, embedded replacement for older ARM9-based control panels. When migrating from legacy displays running Windows CE 6 to Windows Embedded Compact 7 on this device, ensure your TwinCAT boot project target platform is updated to ARMv7. The compiled binaries for older ARM9 architectures must be rebuilt in TwinCAT 2/3 to prevent runtime instruction-set mismatch faults during startup.
The integrated 1-second capacitive UPS is designed exclusively to back up critical variables in the 128 kByte NOVRAM during an unexpected power disruption. This UPS does not support runtime buffering of the entire Windows system image; it is highly critical that cyclic file-writing operations directly to the microSD card are structured carefully. Excessive continuous writes can lead to premature wear of the microSD sectors, which can corrupt the operating system partition during system restarts.
To protect the resistive touchscreen from static-induced register shifts, ensure the front bezel makes solid electrical contact with the cabinet metalwork, and that the cabinet is tied to a low-impedance ground. Use shielded CAT5e or CAT6 cabling for both the RJ45 Ethernet and EtherCAT connections. Route communication cables separately from high-current motor cables and variable frequency drives to suppress electromagnetic interference (EMI).
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Returns & Warranty

Fulfilling the demand for space-saving control interfaces, the Beckhoff CP6601-0021-0020 built-in Panel PC combines an industrial-grade touch display with a reliable ARM Cortex-A8 processor to execute precise control and visualization tasks directly at the machine level. This hardware integration functions as an optimized control node, utilizing its 1 GHz processing core and Windows Embedded Compact 7 environment to run TwinCAT-based PLC automation projects with low power consumption. The mechanical design incorporates a robust aluminum front frame with a sheet-steel rear cover, engineered specifically for flush installation within control cabinets or console enclosures.
| Specification Parameter | Value / Rating |
|---|---|
| Manufacturer | Beckhoff |
| Model Number | CP6601-0021-0020 |
| Processor | ARM Cortex-A8, 1 GHz |
| Motherboard | 3.5-inch compact motherboard |
| System Memory | 1 GB DDR3 RAM |
| Persistent Memory | 128 kByte NOVRAM |
| Storage Slot | 1 x microSD slot (512 MB standard, expandable up to 16 GB) |
| Operating System | Windows Embedded Compact 7 (English) |
| TwinCAT Performance Level | TwinCAT 2: PLC level 30 / TwinCAT 3: PLC level 30 |
| Supply Voltage | 24 V DC (-15% / +20%) |
| UPS Architecture | Integrated 1-second capacitive UPS |
| Display and Touch | 5.7-inch (640 x 480) with single-finger analog resistive touch screen |
| Housing Material | Aluminum front frame with sheet-steel rear protective cover |
| Operating Temperature | 0 to 55 degC |
| Protection Rating | Front side IP65, rear side IP20 |
| Country of Origin | Germany |
| Shipping Weight (Calculated) | 5.0 kg |
| Port / Interface Label | Connector Type | Functional Assignment |
|---|---|---|
| LAN (X101) | RJ45 | 1 x 10/100BASE-T Ethernet port for network integration |
| EtherCAT (X102) | RJ45 | Real-time on-board EtherCAT master interface |
| USB 1 & USB 2 | USB Typ-A | 2 x USB 2.0 host interfaces for external input and updates |
| COM1 (X105) | D-sub 9-pin | 1 x RS232 serial interface for peripheral device communication |
| Power Input | 3-pin terminal block | 24 V DC main power connection and UPS ground reference |
The CP6601-0021-0020 serves as an optimized, embedded replacement for older ARM9-based control panels. When migrating from legacy displays running Windows CE 6 to Windows Embedded Compact 7 on this device, ensure your TwinCAT boot project target platform is updated to ARMv7. The compiled binaries for older ARM9 architectures must be rebuilt in TwinCAT 2/3 to prevent runtime instruction-set mismatch faults during startup.
The integrated 1-second capacitive UPS is designed exclusively to back up critical variables in the 128 kByte NOVRAM during an unexpected power disruption. This UPS does not support runtime buffering of the entire Windows system image; it is highly critical that cyclic file-writing operations directly to the microSD card are structured carefully. Excessive continuous writes can lead to premature wear of the microSD sectors, which can corrupt the operating system partition during system restarts.
To protect the resistive touchscreen from static-induced register shifts, ensure the front bezel makes solid electrical contact with the cabinet metalwork, and that the cabinet is tied to a low-impedance ground. Use shielded CAT5e or CAT6 cabling for both the RJ45 Ethernet and EtherCAT connections. Route communication cables separately from high-current motor cables and variable frequency drives to suppress electromagnetic interference (EMI).
Global Express Shipping
Returns & Warranty
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| Country of origin |
Germany
|