B&R 3IF797.9 Interface Module

Model: 3IF797.9 (aPCI interface module, System2005 series, FlexIQ platformonly)

Important distinction: 3IF797.91 is a separate dualX2XLink variant with different pin assignments. Do not mix them up.

Interface Configuration (All Galvanically Isolated)

1. X2X Link Master (1channel): Master interface for System2005 series I/O module expansion
2. CAN Bus (1channel): Up to 500 kbit/s, transmitreceive object buffer supported, CANopencompliant
3. RS232 (1channel): Serial port for debugging and thirdparty serial device connection

Mandatory Accessories: Two pieces of 0TB704.9 4pin screw terminal blocks. Terminals are not supplied with the module and must be ordered separately.

Key Technical Specifications

Bus types: X2XLink, CAN, RS232, all galvanically isolated

CAN baud rate: Max. 500 kbit/s

Power supply: 5 V DC (aPCI backplane powered)

Operating temperature: 25℃ ~ +55℃

Storage temperature: 40℃ ~ +85℃

Humidity: Max. 95 % noncondensing

Certifications: CE, UL/cULus, UKCA, EAC, KC

Software: Configuration and programming via Automation Studio

Hardware Limitations

Official note: 3IF797.9 is exclusively for FlexIQ Automation PCs. Ordinary System2005 CPU modules cannot accept this card, due to FPGA resource constraints; it will not function on standard CPUs.

Form factor: aPCI slot (internal industrial PC board)

Product family: System 2005 platform, legacy hardware, endoflife. Only newoldstock and used secondhand units are available on market.

Typical Applications

Communication expansion for legacy B&R FlexIQ industrial PCs

Allinone communication: X2X Link remote I/O expansion + CANopen devices + RS232 peripherals

Sparepart service for legacy machinery: packaging machines, textile machinery, injectionmolding machines, printing equipment

SpareParts & Migration Alternatives

1. Original spare parts: Only NOS / secondhand units available. For used modules, verify X2X communication, CAN transmitreceive, RS232 function and isolation withstand voltage.
2. Alternative solution concepts

X2X Link: This bus is discontinued on new platforms. Adopt X20 series for new projects; legacy installations must retain the original card.

CAN: X20IF1063 (X20CANopen module)

RS232: X20IF1091 serial module

⚠️ Software note: Migrating legacy System2005 programs to X20 requires complete reconfiguration; direct hardware replacement is not feasible.

SecondHand Inspection Checklist

1. Visual check: Inspect aPCI gold fingers for oxidation / burn marks; check PCB for corrosion and bulging capacitors.
2. Poweron test: Install in FlexIQ IPC, confirm hardware detection within Automation Studio hardware tree for 3IF797.9.
3. Separate communication tests: Read/write test with X2X I/O modules; CAN bus test with CANopen devices; RS232 sendreceive test.
4. Isolation test: Measure insulation resistance between field interfaces and backplane if test equipment is available.

3IF797.9 VS 3IF797.91 Comparison Table

Practical Replacement Guidelines

1. Original host is FlexIQ IPC: Prefer 3IF797.9. Although 3IF797.91 can be detected by hardware, RS232 changes to DB9 and existing field wiring must be reworked.
2. Original host is standard aPCI IPC (nonFlexIQ): Only 3IF797.91 works; 3IF797.9 will not operate.
3. Usedpart procurement: Always check complete part number including suffix; ordering based only on “3IF797.9” without the suffix may result in nonfunctional hardware.
4. Wiring note: All three buses on 3IF797.9 run via 0TB704.9 terminals. On 3IF797.91 RS232 uses DB9, CAN and X2X use 0TB704.9 terminals.

Additional Notes for SecondHand Testing

3IF797.9: All communication channels must be tested via terminal blocks.

3IF797.91: RS232 can be tested directly via DB9 connector; CAN / X2X via 0TB704.9 terminals.

B&R 3IF797.9 Practical Application Cases

Hardware prerequisite: Installed in a FlexIQ IPC aPCI slot. Allinone interfaces: X2XLink Master + CANopen + RS232, all galvanically isolated.

Product positioning: Legacy OEM board widely deployed 20042012 with FlexIQ IPCs. No newproject deployment; exclusively for installedbase sparepart maintenance.

Case 1: Blowmolding Machine (Hollow Forming Equipment)

System Architecture: FlexIQ (PP481) IPC + 3IF797.9

X2XLink: Local / remote System2005 I/O modules for barrel temperature acquisition, wallthickness sensors and valve outputs

CANopen: Servodrive control for blowpin movement and mold opening/closing

RS232: Connect weighing instruments and wallthickness gauges for processdata acquisition

Process: Closedloop parison wallthickness control, cycle time ~2 ms for hollow blowmolding production

Common field failure: Aged hardware causes CAN packet loss leading to servo jitter; X2X link dropout triggers full machine stop.

Case 2: Textile Machinery (Warpknitting / Circular Knitting / Dyeing Equipment)

System Architecture: FlexIQ IPC + 3IF797.9 + EX470 / X67 remote I/O

X2XLink: Distributed System2005 I/O for proximity switches and solenoid valves on machine frames

CANopen: Multiaxis servo synchronization for warpfeed and fabric takeup

RS232: Tension controllers and dyemachine temperature controllers

Industryspecific failure: Heavy workshop dust causes goldfinger oxidation, a common failure mode for used boards.

Case 3: Packaging Machinery (Vertical FormFillSeal, Postprint Carton Packaging)

System Architecture: FlexIQ IPC as main controller with 3IF797.9 communication expansion

X2XLink: EX470 remote I/O distributed at feeding, sealing and cutting stations

CANopen: AC110 servo drives for film feeding, traction and cutting via electronic cam profiles

RS232: Barcode scanners and label printers for batchcode marking on finished bags

Distinction: Many packaging machines use 3IF771.9 (CANonly). 3IF797.9 is selected where X2X + CAN + RS232 are all required.

Case 4: Legacy AllElectric InjectionMolding Machine

System Architecture: FlexIQ IPC + 3IF797.9

X2XLink: System2005 I/O for safetydoor interlocks, temperature control and hydraulic valves

CANopen: Servodrives for injection, plasticizing and mold openclose motion

RS232: Legacy external moldtemperature controllers via ModbusRTU (RS232level) for temperature setpoint and readback

Note: Native RS232 without RS485 hardware. An external levelconverter is required for ModbusRTU485.

Case 5: Tire Machinery (Steelcord cutting & rubber extrusion lines)

System Architecture: FlexIQ IPC + 3IF797.9

X2XLink: Longdistance X67 IP67rated field I/O mounted on machine frames

CANopen: Multiaxis servo synchronization for cutting, material feeding and webedge correction

RS232: Thicknessmeasurement gauges for realtime rubbersheet thickness data acquisition.

Typical System Topology for 3IF797.9

FlexIQ IPC (aPCI slot) → 3IF797.9

1. X2XLink Master → EX470, XX436, X67 I/O modules
2. CAN (CANopen Master) → B&R AC110 servos and thirdparty CANopen devices
3. RS232 → Meters, printers, barcode scanners and thirdparty serial peripherals

Common OnSite Faults from InstalledBase Maintenance

1. Only functional inside FlexIQ IPC; inserting into standard System2005 aPCI hardware results in communication failure.
2. Aging / loose 0TB704.9 terminal blocks cause intermittent X2X / CAN communication.
3. Damaged galvanicisolation circuits: external interference triggers IPC crash.
4. ESDdamaged RS232 interface: serial channel fails while X2X and CAN remain operational.

ProjectSelection Guidance: 3IF797.9 vs 3IF797.91

Original hardware = FlexIQ IPC: Use 3IF797.9, all field signals routed over 0TB704.9 terminals.

Original hardware = standard aPCI IPC (nonFlexIQ): Use 3IF797.91. RS232 uses DB9 connector; 3IF797.9 will not work.

B&R 3IF797.9 Full Technical Specifications

Model: 3IF797.9; aPCI communication module, FlexIQ IPC exclusive. FPGA constraints prevent operation on standard System2005 CPU / aPCI hosts.

Product status: Endoflife. Mandatory accessories: 2 × 0TB704.9 4pin screw terminals (not supplied with module)

1. Interface Specifications (All Galvanically Isolated)

Physical termination: All three interfaces connect via two 0TB704.9 screw terminal blocks. No DB9 connector on PCB.

2. Electrical Characteristics

Backplane power: 5 V DC (aPCI backplanefed; no external 24 V supply)

Typical power consumption: ~2.5 W

Galvanic isolation: Isolation between X2XLink / CAN / RS232 and IPC backplane

CAN bus: Requires external termination resistor; no onboard 120 Ω termination

3. Environmental Conditions

Operating temperature: 25 ℃ ~ +55 ℃

Storage temperature: 40 ℃ ~ +85 ℃

Relative humidity: 595 %, noncondensing

Ingress protection: Bare PCB for internal IPC installation; no enclosure rating.

4. Hardware & Mechanical Installation

Slot form: aPCI (internal IPC addon card)

Firmware constraint: Operates only inside FlexIQ Automation PC. Other aPCI hosts detect hardware but communication fails.

Status LEDs: Separate transmitreceive LED indicators for X2X, CAN and RS232 channels

Software: Automation Studio for hardware configuration, CANopen setup and serialdriver assignment

Certifications: CE, UL/cULus, UKCA, EAC, KC

5. Critical Engineering Limitations
6. ❗Not usable with standard System2005 CPU or nonFlexIQ aPCI IPC. Hardware may be detected but communication will fail; this is a FPGA firmware limitation, not a wiring fault.
7. RS232 only supports RS232 signal levels. External level converter required for ModbusRTU485.
8. X2XLink works exclusively with legacy System2005 I/O; cannot connect directly to X20 I/O.
9. CAN bus has no builtin termination. Fit external 120 Ω resistors at both physical bus ends.
10. 0TB704.9 terminal blocks must be ordered separately; not factoryfitted to the module.
11. Condensed Parameter Comparison: 3IF797.9 vs 3IF797.91

7. Diagnostics & FailureMode Notes

LED behaviour: Each communication channel features transmitreceive status LEDs. Flashing = bus traffic present; steadyoff = no message activity.

Isolationcircuit damage symptom: External interference may crash the host IPC; one field interface can fail while the remaining two channels remain functional.