Mitsubishi AJ65SBTB1-32D Compact Remote Input Module

AJ65SBTB1-32D is a Mitsubishi MELSEC CC-Link compact remote DC digital input module

1. Model Code Definition

AJ65: CC-Link remote I/O module series

SBTB1: Compact remote I/O main body

32: 32 I/O points

D: Digital Input (DC input)

2. Key Specifications

3. Application Scenarios

Remote sensor signal acquisition for production lines: photoelectric sensors, proximity switches, magnetic switches, pushbutton signals

Distributed I/O architecture to reduce bulk hardwiring from control cabinets to field devices via CC-Link bus networking

Compatible with Mitsubishi Q-series, FX3U/FX5U PLCs equipped with CC-Link master station

4. Model Distinction (Frequently Confused Models)
5. AJ65SBTB1-32D: Standard version, 1.5ms response, 32DI
6. AJ65SBTB1-32D1: High-speed version, 0.2ms response, 32DI, preferred for high-frequency sensors
7. AJ65SBTB1-32T: 32-point transistor output module
8. AJ65SBTB1-32DT: 16-input +16-output mixed I/O module

Lifecycle note: AJ65SBTB1-32D is discontinued. Only stock or used units available. For new projects, AJ65SBTB1-32D1 is the preferred replacement. Same mounting dimensions and terminal definitions; only faster response speed, no program modification required.

5. Installation & Wiring Guidelines
6. Power supply: Independent DC24V supply for module itself; sensors also use DC24V signal
7. CC-Link bus: DA/DB cables; 110Ω terminating resistors fitted at both ends of the bus
8. Common terminals: 8 points per common group, supports NPN/PNP. Keep unified polarity during wiring
9. Earthing: Reliable earthing on FG terminal to reduce bus interference
10. Station number setting: DIP switches on module body to set CC-Link station number
11. Common Fault Troubleshooting
12. RUN indicator off: Check DC24V supply, polarity and internal fuse
13. ERR indicator flashing: CC-Link communication failure. Inspect DA/DB wiring, terminating resistors, duplicate station numbers, shield earthing
14. No signal at input channel: Verify sensor power supply and common polarity; measure terminal voltage with multimeter; check for damaged optocoupler channel
15. False signal triggering: Cable interference, use shielded cable; check response time. For long cables, select D1 high-speed variant
16. Alternative Selection List
17. Direct drop-in replacement (same size & terminals): AJ65SBTB1-32D1 (Recommended for new projects)
18. Domestic compatible CC-Link 32DI remote I/O: Inovance, Inwell CC-Link remote input modules (verify CC-Link version and register mapping)
19. Upgrade to CC-Link IE Field bus: NZ-series remote I/O (hardware architecture completely different; PLC program rewrite required)
20. HS Code Reference

8537101100 (Programmable controller digital input module, for customs declaration only; subject to customs final judgement)

CC-Link Master Station Parameter Configuration (for AJ65SBTB1-32D, Remote I/O Station, occupies 1 station)

Master module: QJ61BT11N (Q-series); Programming software: GX Works2; AJ65SBTB1-32D = Remote I/O Station, occupies 1 station, 32-point RX input, no RY output and no RW registers.

Master station fixed station number: Station 0. Slave AJ65SBTB1-32D station number set via DIP switch: 1~64. Station 1 is used in this example.

1. Hardware DIP Switch (Set AJ65SBTB1-32D first!)
2. Station number DIP switch: Binary DIP switch for station address (e.g. Station 1 = 00000001)
3. Baud rate DIP switch: Must match master station baud rate

000 → 156kbps

001 → 625kbps

010 → 2.5Mbps (most commonly used on site)

011 → 5Mbps

100 →10Mbps

Fit 110Ω terminating resistors at both ends of the bus

2. GX Works2 Q-series CC-Link Master Basic Parameters

Path: Project Navigator → Parameters → Network Parameters → CC-Link

Station Information (Critical!)

Click [Station Information], add Station No.1:

Remote I/O station soft element mapping rule:

Station1: RX0~RX1F correspond to the 32 DI channels of AJ65SBTB1-32D

PLC internal soft elements for master station: RX mapped to PLC X addresses (auto-refreshed by GX Works)

3. Soft Element Refresh Mapping (QJ61BT11N)

CC-Link automatic refresh:

RX: Remote input → PLC internal X

RY: PLC output → Remote module output

RWw: PLC writes to remote registers

RWr: Remote registers read into PLC

AJ65SBTB1-32D (Station 1)

RX0~RX1F (32bit) = 32 DC input channels of the module

Example: Sensor ON → RXn=ON; read RX bit directly in program.

4. FX5U + FX5-CCL-MS (FX5U CC-Link Master, GX Works2/3)

FX5U with FX5-CCL-MS master card can connect AJ65SBTB1-32D

1. Project → Parameters → CC-Link Parameters, Master type: Master station, Ver.1 mode
2. Add station entry for Station 1: Remote I/O Station, occupies 1 station, RX=32, RY=0
3. Soft element refresh: RX mapped to FX5U X or M (customizable refresh address)

FX5U built-in Ethernet CC-Link IE Field Basic cannot directly connect old AJ65SBTB1-32D. This classic CC-Link uses RS485 bus and requires FX5-CCL-MS module.

5. Download & Commissioning Steps
6. Complete all parameter settings, click [Check], confirm no errors;
7. Write [Parameters + Program] to PLC; PLC reset;
8. Power up remote modules with DC24V first, then power up PLC master station;
9. Observe indicators:

M/S: Master steady ON; RUN: Slave steady ON;

ERR off = Communication normal; ERR flashing = bus fault;

5. Online monitor RX soft elements; trigger sensors and verify corresponding RX bits turn ON/OFF.
6. Common Mistakes
7. ❌ Wrong station type: selected as Remote Device Station → communication failure; must use Remote I/O Station
8. ❌ Baud rate mismatch between master and slave
9. ❌ Missing terminating resistors, random disconnection over long cables
10. ❌ Duplicate station numbers, frequent in multi-slave networks
11. ❌ Ver.2 mode enabled; old AJ65SBTB1-32D is Ver.1 compatible, use Remote Net Ver.1 Mode by priority
12. Sample Program (ST / Ladder compatible)

Directly monitor RX0~RX1F, no special communication instruction required, CC-Link auto cyclic refresh.

Example: LD RX0 reads channel 0 input of AJ65SBTB1-32D.

Optional extensions available upon request:

1. Screenshot-style GX Works2 CC-Link parameter setup guide
2. Batch parameters for multiple AJ65SBTB1-32D network (Station1, Station2, Station3…)
3. Communication fault code (ERR lamp) reference table
4. Ladder example to map RX to internal M relays for easier programming

CC-Link ERR Lamp + QJ61BT11N Fault Code Reference Table (For AJ65SBTB1-32D)

Two sections: Quick LED Indicator Diagnosis (On-site check) + Hex Fault Codes read from GX Works Diagnosis (Precise troubleshooting)

Master: QJ61BT11N; Slave: AJ65SBTB1-32D

1. LED Status Quick Reference (Master QJ61BT11N ERR Lamp)

Slave AJ65SBTB1-32D L.ERR Indicator

PW lamp OFF: No DC24V supply to slave, check power terminals and fuse first.

L.RUN lamp OFF: Data link not established; master cannot detect this slave station.

2. QJ61BT11N Master Hex Fault Codes (Read via GX Works CC-Link Diagnosis)

3. Q-series CC-Link Special Relay SW (Monitor in GX Works)

Identify offline station quickly via SW registers

1. SW0080~SW0083: Link error bits, bit maps to station number. ON = fault at that station

SW0080 bit0 = Station1 fault; bit1 = Station2 fault, and so on

2. SW006B: Detailed error type

0: Normal

1: Transmission line fault

2: Parameter error

3: CRC error (electromagnetic interference)

4: Timeout error (slave no response)

5: Abort error

6: Setting error

4. On-site Troubleshooting Sequence (AJ65SBTB1-32D)
5. Check slave PW lamp: OFF → inspect DC24V supply
6. Check slave L.RUN / L.ERR lamp
7. Open GX Works → CC-Link Diagnosis, read fault code + SW0080 to locate faulty station
8. Verify: station number, baud rate, station type (Remote I/O Station)
9. Check DA/DB polarity, 110Ω terminators at both bus ends
10. Single-point earthing for shield; avoid both-end earthing to prevent ground loop
11. Separate CC-Link cable away from power cables to reduce interference
12. Common Pitfall Summary
13. Remote I/O Station mistakenly selected as Remote Device Station → BBC2 station type error, ERR flashing
14. Master Ver.2 mode enabled, old AJ65SBTB1-32D incompatible → B983 invalid module type
15. Terminating resistor fitted only on one end → random flashing, intermittent disconnection
16. DA DB wires reversed, entire bus down, master ERR steady ON
17. Modify DIP switches while powered on, slave L.ERR flashes periodically; power cycle to recover

Mitsubishi AJ65SBTB1 Series (CC-Link Compact Remote I/O, Screw Terminal Block, all discontinued, 1 station occupancy)

Suffix definition

D: DC Digital Input; D1: High-speed Input; D5: 5V Input

T: Sink transistor output; T1: High-speed transistor output; TE1: Source transistor output

DT: Mixed Input+Output; K: Special common terminal specification

All modules in this series are Remote I/O Stations (not Remote Device Stations), CC-Link Ver.1 compatible

1. Pure DC Input Modules (DI)

2. Pure Transistor Output Modules (DO)

3. Mixed I/O Modules (DI+DO)

Distinguish other family series (AJ65SBTB2 / AJ65SBTB32 / AJ65SBTC connector type, NOT SBTB1 series)

Frequently confused during procurement, not part of SBTB1 series, reference only

1. AJ65SBTB2: Relay output R, analog A modules

AJ65SBTB2-8R, AJ65SBTB2-16R (relay output); AJ65SBTB2-8A, 16A analog

2. AJ65SBTB32: Compact small terminal block

AJ65SBTB32-8DT / 8DT2, AJ65SBTB32-16DT / 16DT2, AJ65SBTB32-16DR (mixed relay)

3. AJ65SBTC: Quick connector type (not screw terminals)

AJ65SBTC1-32D, AJ65SBTC1-32T, AJ65SBTC1-32DT, field plug wiring, different form factor from SBTB1

Selection Notes

1. All AJ65SBTB1 series are discontinued. Not available for new project purchase, only stock / used units.
2. Same mounting dimensions: same point count D/D1, T/T1, DT/DT modules support direct drop-in replacement with no program modification.
3. Station type: Must select [Remote I/O Station] in GX Works parameter; fixed 1 occupied station.
4. Analog modules are not in SBTB1 series: models AJ65SBT-64AD, AJ65SBT2B-64AD etc.