Siemens 6ES7963-3AA10-0AA0 – Interface Module IF963-X27 (RS-422/RS-485)
Overview
The Siemens SIMATIC S7-400 IF963-X27 interface module with MLFB 6ES7963-3AA10-0AA0 provides the RS422/RS485 interface for point-to-point communication with the S7-400 CP441 communication processor. Supporting transmission rates up to 115.2 kbps and distances up to 1200 m at 19.2 kbps, the IF963-X27 is the module of choice for long serial links between S7-400 systems and field devices.
Engineering and Design
The Siemens IF963-X27 module terminates the CP441 COM interface with the differential RS422/RS485 signals that tolerate electrical noise and support longer cable runs than RS232. The module handles the physical layer only, while the CP441 supplies the protocol handling and configuration. With an input current of approximately 41 mA and a typical power loss of 0.14 W, the IF963-X27 adds a negligible load to the S7-400 rack supply.
The RS422/RS485 interface is wired with the A and B twisted pair, and the line is terminated at the far end according to the CP441 manual for the selected standard. The differential signalling rejects the electrical noise of industrial cabinets, and the screened cable is routed away from VSD output cables. The point-to-point configuration supports one partner per CP441 channel, and the baud rate is selected in the S7-400 hardware configuration with the maximum of 115.2 kbps available to the application.
Key Features
- RS422/RS485 interface for point-to-point coupling with CP441
- Transmission rate up to 115.2 kbps
- Cable distance up to 1200 m at 19.2 kbps
- Input current approximately 41 mA
- Typical power loss 0.14 W
- MLFB 6ES7963-3AA10-0AA0
Applications
The IF963-X27 connects S7-400 systems to remote instruments, VSDs, weigh scales, gateways and other controllers over long or noisy serial runs where RS422/RS485 differential signalling is required. Plants across Oman and the GCC use the 6ES7963-3AA10-0AA0 for CP441 links between control rooms and field equipment, with the 1200 m reach covering typical plant distances.
The 1200 m reach at 19.2 kbps covers the distances between control rooms and field equipment typical of GCC plants, and the low input current of approximately 41 mA keeps the additional load on the rack supply negligible. When a serial link fault appears, the first checks are the termination, the wiring polarity and the configuration in the CP441, before the module itself is replaced. Keeping the IF963-X27 in the spare stock covers the majority of CP441 serial link failures.
The polarity of the A and B line is checked against the connected device before the link is energised, and the termination resistance is fitted at the far end of the pair. Galvanic isolation between cabinets is provided by the differential interface of the standard.
The cable pair is twisted and screened, and the screen is bonded at one end of the run.
The termination settings are recorded in the link documentation of the system.
Specifications
| Parameter | Value |
|---|---|
| Product | Siemens SIMATIC S7-400 IF963-X27 |
| MLFB | 6ES7963-3AA10-0AA0 |
| Interface | RS422 / RS485 |
| Transmission rate | Up to 115.2 kbps |
| Cable length | 1200 m at 19.2 kbps |
| Function | Point-to-point coupling with CP441 |
The Siemens IF963-X27 module is identified by its MLFB number and is ordered together with the CP441 processor of the system. The 1200 m reach at 19.2 kbps and the differential interface are the reasons the Siemens IF963-X27 module is selected for field links.
The differential interface tolerates the potential difference between cabinets, so the X27 module is preferred for links that cross panel boundaries in the plant. The termination is fitted at the receiving end.
The module list of the S7-400 system should therefore include the IF963-X27 type of each serial channel, so the correct spare is identified during a stoppage.
This record is normally kept in the panel drawing of the S7-400 cabinet.
Why Seven Star LLC
Seven Star LLC supplies genuine Siemens SIMATIC S7-400 modules and communication spares to industrial plants in Oman and the GCC. We verify the MLFB number of each IF963-X27 module and confirm the interface type and cable distance against your serial link design before release.
Technical Specifications
The IF963-X27 (6ES7963-3AA10-0AA0) is a point-to-point serial interface module for the Siemens SIMATIC S7-400, used together with the CP441 communication processor to provide an RS422/RS485 physical interface, in place of the RS232 variant covered by the related IF963-RS232 submodule. Like the RS232 version, it plugs directly into the CP441’s interface slot, and is compact at approximately 19 × 67 × 87mm, weighing around 40g.
RS422/RS485 is a differential signaling standard that, compared with single-ended RS232, tolerates significantly longer cable runs and supports multi-drop wiring where several devices share the same communication line — the specific reason plants choose the X27 submodule over the RS232 variant when the peripheral equipment is located further from the S7-400 rack or when multiple devices need to be daisy-chained on one serial link.
Applications and Compatibility
This interface module is used for point-to-point or multi-drop serial communication between an S7-400 CP441 and RS422/RS485-compatible instruments, drives, or third-party controllers — a common requirement in process plants where field devices are distributed across a wider area than RS232’s short cable-length limit would allow. As with the RS232 variant, it is a direct-fit spare/replacement part and must match the specific CP441 hardware and firmware version already installed in the rack.
Why Seven Star LLC
Seven Star LLC supplies genuine Siemens SIMATIC S7-400 spare parts, including CP441 interface submodules such as the IF963-X27, to industrial customers across Oman and the wider GCC maintaining legacy or actively running S7-400 automation systems, and verifies compatibility with the customer’s existing CP441 hardware before confirming an order.
Request a Quote for Siemens 6ES7963-3AA10-0AA0 – Interface Module IF963-X27 (RS-422/RS-485)
Submit a formal inquiry through our RFQ page with your CP441 module, serial protocol and cable distance. Our team will confirm the correct Siemens IF963-X27 interface module for your link and provide a detailed quotation.
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