Yokogawa ALR121-S00 Serial Communication Module

Frequently Asked Questions (FAQ)

Q1: What communication protocols are supported by ALR121-S00?
A1: It supports FA-M3, Modbus RTU, MELSEC-A, YS direct, YS via SCIU, SLC500, and PLC-S.

Q2: Does ALR121-S00 support multipoint communication?
A2: Yes, when using RS-485 interface, it supports multipoint communication.

Q3: How many subsystems can be connected per port?
A3: Up to 30 subsystems per port, depending on the protocol used.

Q4: Can the two ports of ALR121 use different protocols?
A4: No, both ports must use the same communication protocol.

Q5: Does ALR121 support dual-redundant communication?
A5: Yes, by installing two identical ALR121 modules in a redundant configuration.

Q6: What is the maximum supported baud rate for Modbus communication?
A6: Up to 19200 bps for Modbus.

Q7: Can ALR121 communicate with YS1000 series instruments?
A7: Yes, ALR121 supports both direct RS-485 connection and SCIU interface for YS1000/YS100 instruments.

Q8: What is the maximum transmission distance of ALR121?
A8: The maximum is 1200 meters when using RS-422/RS-485 interface.

ALR121-S00 Serial Communication Module Yokogawa

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