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SiemensThe 6ES7441-2AA05-0AE0 is a point-to-point communication processor (CP 441-2) in the Siemens SIMATIC S7-400 series.
It is primarily used to extend the serial communication capabilities of the S7-400 CPU, exchanging data with printers, other controllers, or field devices through two variable communication interfaces. This module supports multiple standard protocols and can support user-specific protocols by loading drivers.

| Brand |
SIEMENS |
| Model / Part Number | 6ES7441-2AA05-0AE0 |
| Number of Interfaces | 2 (variable) |
| Supported Interface Types | RS 232C (V.24), 20 mA (TTY), RS 422/RS 485 (X.27) |
| Maximum Transfer Rate | 115.2 kbit/s (RS 232 / RS 422 / RS 485) |
| Supported Protocols | 3964 (R), ASCII, RK 512, Printer Driver, Modbus RTU (driver required) |
| Power Consumption | +5V DC backplane bus, maximum 300 mA |
| Power Dissipation | Typical 2.7 W |
| Dimensions | 25 mm x 290 mm x 210 mm |
| Operating Temperature | 0℃ to 60℃ |
Q: What are the main applications of this module?
A: It's primarily used in scenarios where the S7-400 CPU needs to communicate with external serial devices, such as connecting a serial printer to print reports, or exchanging data with third-party instruments, frequency converters, etc., via the Modbus RTU protocol.
Q: Can I use this module to enable communication between my S7-400 and third-party devices via Modbus RTU?
A: Yes. This module supports communication with third-party Modbus devices by loading Modbus RTU master or slave drivers. You will need to purchase the corresponding driver software (e.g., 6ES7870-1AA01-0YA0).
Q: What additional purchases are required to use this module?
A: Yes. In addition to the module itself, you will also need:
Interface Module: Select the corresponding interface module (e.g., IF963) based on the physical interface type (RS232, TTY, RS422/485). This needs to be ordered separately.
Software driver: If using non-built-in protocols such as Modbus RTU, you need to purchase the corresponding loadable driver.
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