The AJ65SBTB1-8T is an 8-point remote I/O station with transistor sink outputs, built for Mitsubishi's CC-Link or MELSECNET fieldbus networks. It switches DC loads between 10.2 and 26.4 V, with each point rated for 0.5 A and a common limit of 2.4 A. The unit draws 35 mA from the 24 VDC bus when all points are on, so it won't strain a small power supply.
What the ratings mean for fit
The sink-type output means the load connects between the positive supply and the output terminal — common for Japanese PLC families. Outputs are photocoupler-isolated from the backplane, with a Zener diode surge suppressor across each point. The response time is 0.5 ms or less turning on, 1.5 ms or less turning off with a resistive load. That's fast enough for solenoid valves and indicator lamps, but not for high-speed pulse trains. Protection is built in: overload, overvoltage, and overheat shutdown. If a point gets shorted, the protection kicks in before the trace burns. The voltage drop across the output is 0.3 V typical at 0.5 A — low enough to keep the load voltage within spec even with a long cable run.
Mounting and wiring
The module measures 87.3 mm wide, 50 mm high, 40 mm deep. It mounts inside a control panel (IP2X protection) on a DIN rail or with screws. Wiring is via two-piece terminal blocks: a 7-point block for the communication and unit power, and a 10-point direct-mount block for the I/O power and outputs. The terminal screws are M3, so use a small driver and don't overtighten. It occupies one station on the network and expects a pollution degree of 2 or less, overvoltage category II. Ambient temperature range is 0 to 55 °C operating, -20 to 75 °C storage. Keep it out of condensing humidity and corrosive atmospheres.