B&R X20DI9371 Digital Input Module

Model Code Explanation

X20DI9371

X20: X20 distributed I/O system platform

DI: Digital Input

9371: Module specification code

2. Main Electrical & Hardware Specifications

3. Mechanical & Environmental Specifications

Mounting: Standard 35 mm DIN rail, horizontal installation

Dimensions: W 40 mm × H 100 mm × D 76.5 mm

Operating Temperature: -20 ℃ ～ +60 ℃ (inside control cabinet)

Storage / Transport Temperature: -40 ℃ ～ +85 ℃

Protection Class: IP20 (for cabinet installation only)

Certifications: CE, UL 508, GL marine certification, compliant with EN 61000 EMC industrial standards

4. Internal Structure & Terminal Definition

16 channels divided into 4 isolated groups:

Group1: CH0～CH3

Group2: CH4～CH7

Group3: CH8～CH11

Group4: CH12～CH15

⚠️ Important Wiring Rule: The common terminal of one isolated group must share the same 24 V polarity; Do NOT connect separate, non-referenced 24 V power supplies to different isolated groups, otherwise potential difference may damage the isolation circuit.

Wiring Configurations

1. Sourcing Input (PNP Sensor)

Sensor output connects to module DI terminal; module common terminals connect to 0V(GND)

2. Sinking Input (NPN Sensor)

Sensor power terminal connects to 24V+, sensor output to DI terminal; module common terminals connect to +24V

5. Operating Principle

External digital sensor signal → Front-end RC hardware filter circuit → Optocoupler isolation group → Signal shaping circuit → X20 bus communication chip

The controller cyclically reads channel status via X2X/X20 CPU. Filter time parameters can be configured in Automation Studio to suppress contact bounce and interference pulses generated by inverters.

6. Software Information

Programming Software: Automation Studio 4.0 and all later versions supported

Hardware Identification: Standard X20 device description built-in library, no extra GSD file required

Process Image: Automatic channel address mapping; support signal forcing & online signal monitoring

Supported Functions: Channel diagnosis (no wire break detection, X20DI9371 does not support wire break diagnosis)

7. Model Comparison & Compatible Replacement

Comparison with similar models in X20 series

✅ Direct Replacement Conditions

If X20DI9371 is used in existing projects:

Upgrade for higher anti-interference performance: X20DI9372 (pin assignment compatible, no program modification required, wiring fully interchangeable; only difference is enhanced isolation performance)

❌ Not directly interchangeable: X20DI4371 has different channel quantity and terminal layout of base unit

8. Typical Application Scenarios

Machine tools, packaging machinery, material handling conveyors, rubber & plastic equipment, water treatment, general automation production lines

Signal acquisition: Proximity switches, photoelectric sensors, limit switches, pushbuttons, passive relay contacts

9. Installation Guidelines & Troubleshooting

Strict Prohibitions

1. Never apply voltage higher than 30 VDC, will permanently damage input circuits
2. Do not connect two non-common-ground 24 V power supplies to different isolated groups
3. Avoid parallel routing of signal cables and power cables (strong electrical interference leads to flickering signals)

Common Faults

1. Channel LED always ON: Signal wire short-circuited to ground; abnormal power supply for PNP sensor
2. Signal intermittent fluctuation: Severe electromagnetic interference → increase hardware filter time; check shielding & earthing
3. All channels in one group no signal: Loss of power supply to the corresponding group common terminal
4. Compatible Base Units

Standard base: X20BM01 (screw terminal base)

Optional base: X20BM11 (spring-cage quick connect terminal)

Base must be ordered separately; terminal base is NOT included with the module!

X20DI9371 Terminal Pin Assignment

Compatible Base: X20BM01 (screw) / X20BM11 (spring terminal)

16 channels split into 4 galvanically isolated groups (4 channels each)

Group1: CH0～CH3｜Group2: CH4～CH7｜Group3: CH8～CH11｜Group4: CH12～CH15

Terminal Sequence (Top to bottom on base)

Group 1 (CH0~CH3)

1: DI0

2: DI1

3: DI2

4: DI3

5: COM0 (Common terminal for Group1)

Group 2 (CH4~CH7)

6: DI4

7: DI5

8: DI6

9: DI7

10: COM1 (Common terminal for Group2)

Group 3 (CH8~CH11)

11: DI8

12: DI9

13: DI10

14: DI11

15: COM2 (Common terminal for Group3)

Group 4 (CH12~CH15)

16: DI12

17: DI13

18: DI14

19: DI15

20: COM3 (Common terminal for Group4)

Wiring Specifications Recap

1. PNP Sensor (Sourcing Input, Industry Standard)

All COM0/COM1/COM2/COM3 → connect to 24 VDC 0V(GND)

Sensor signal wire to DIx, sensor positive terminal to 24V+

2. NPN Sensor (Sinking Input)

All COM0/COM1/COM2/COM3 → connect to +24 VDC

Sensor signal wire to DIx, sensor negative terminal to 0V

⚠️ Important: COM0/COM1/COM2/COM3 are galvanically isolated from each other.

Do not connect different COM terminals to power supplies with non-shared ground potential!

Steps to Configure Input Filter in Automation Studio

1. Locate X20DI9371 in project tree and double-click to open configuration window
2. Parameter Name: Input filter time

Selectable options:

0.1 ms (fast response, for high-speed signals)

0.5 ms

3 ms (recommended for normal pushbuttons & proximity switches)

15 ms (heavy interference environment, suppress contact bounce)

3. Download project; parameters take effect immediately without power cycle