FAQ (10 Questions & Answers)

Q1: What is the transmission speed of ALF111‑50?

A1: It operates at 31.25 kbps, consistent with FOUNDATION Fieldbus H1 standard.

Q2: How many fieldbus devices can one segment support with ALF111‑50?

A2: Up to 32 devices per segment (including the ALF111 module itself).

Q3: What is the maximum number of control I/O points per segment?

A3: Up to 48 control I/O points per segment.

Q4: What are the isolation / withstanding voltage ratings?

A4: Approximately 1500 V AC for 1 minute between field and system, and between channel to channel.

Q5: What is the module’s weight?

A5: About 0.40 kg.

Q6: What are the size dimensions of ALF111‑50?

A6: ~ 26.0 cm × 18.0 cm × 6.0 cm.

Q7: What is the operating temperature range?

A7: From −20 °C to +70 °C.

Q8: What redundancy options are available?

A8: Dual redundancy is supported in many configurations (i.e. two ALF111‑50 modules for failover).

Q9: What kind of terminals / bus connections are used?

A9: Pressure‑clamp terminals; removable terminal block with built‑in terminators; switchable terminators on some ports.

Q10: What devices / node units is ALF111‑50 compatible with?

A10: Compatible with Yokogawa node / field I/O units such as ANB10, ANR10, AFF50, AFV10 (including “S” or “D” variants).