Siemens C79459-A1715-B21 SIMATIC S7 Hardware Dongle
Manufacturer: Siemens
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Part Number: C79459-A1715-B21
Condition：New with Original Package
Product Type: Communication Processors
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Country of Origin: USA
Payment:T/T, Western Union
Shipping port: Xiamen
Warranty: 12 months
Siemens C79459-A1715-B21 SIMATIC S7 Communication Hardware Dongle
Configured for driver authorization in SIMATIC S7 automation systems, the Siemens C79459-A1715-B21 (C79459-A1715-B21 Hardware Dongle) provides direct physical execution of licensed software unlock routines on designated hardware modules. The unit seats into dedicated key slots on CP 341 and CP 441-2 communication processors to initialize loadable Modbus protocol stacks across backplane bus interfaces. Operating as a hardware-level electronic key, it unlocks RTU/ASCII serial communication channels without consuming external rack power. Note that this specific B21 variant does not authorize Allen-Bradley Data Highway protocol execution.
Suffix Breakdown & Model Matrix
| Base Part Number | Suffix Code | Module Designation | Protocol Authorization | Compatibility Range |
|---|---|---|---|---|
| C79459-A1715 | -B21 | Modbus Dongle | Modbus RTU / Modbus ASCII | CP 341, CP 441-2 |
| C79459-A1715 | -B22 | Data Highway Dongle | Allen-Bradley Data Highway | CP 341, CP 441-2 |
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | C79459-A1715-B21 |
| Brand | Siemens |
| Origin | Germany |
| Weight | 0.1 kg |
| Dimensions | Standard SIMATIC dongle form factor |
| Operating Temp | 0 deg C to +60 deg C |
| Power Consumption | Powered via backplane bus |
| Product Type | Hardware Dongle / Authorization Key |
| Primary Protocol | Modbus RTU / ASCII |
| Compatible Modules | CP 341, CP 441-2 |
| Mounting Type | Direct plug-in interface slot |
Industrial Control & Communication Attributes
Siemens SIMATIC S7 communication processors execute deterministic backplane bus communication velocity across rack architectures using dedicated hardware authorization keys. The Siemens C79459-A1715-B21 dongle interfaces directly with the CP 341 and CP 441-2 ASIC bus controllers to provide immediate driver authorization upon backplane initialization. This hardware-level validation routine bypasses CPU scan cycle overhead, preventing network polling latencies during high-density I/O register exchanges. Firmware flash compatibility checks ensure that the dongle key matches the loadable Modbus driver revision loaded within the non-volatile memory of the communication module.
Frequently Asked Questions
Q: Can engineers hot-swap the C79459-A1715-B21 dongle while the communication processor remains powered?
A: No. Engineers must depower the CP 341 or CP 441-2 rack segment prior to inserting or removing the hardware dongle. Removing the dongle during active execution triggers a driver fault state on the backplane interface, halting all Modbus communication cycles until a full module reset occurs.
Q: Does the C79459-A1715-B21 hardware dongle require additional backplane current or external power connections?
A: No external wiring or power connections are necessary. The dongle draws negligible current directly from the internal logic bus of the host communication processor when inserted into the designated rear slot.
Field Installation Guidelines
Field technicians must maintain strict ESD static control protocols before handling the dongle. Static discharge to the exposed gold-plated contact pins can corrupt internal hardware registers. Ensure that the host PLC rack power supply is completely switched off before installation.
Orient the key correctly with the rear slot of the CP 341 or CP 441-2 module. Gently push the dongle into the socket until the retaining clips engage fully. Do not force the module if resistance occurs, as bent contact pins will result in initialization failures. After securing the hardware, restore rack power and verify that the module diagnostic LEDs report normal driver initialization without active bus fault indicators.