1. General Introduction
ALR121 Serial Communication Module installed on Field Control Unit for signal communication between Field Control Unit and the subsystems such as PLCs and etc, supports modbus protocol RS-232 and RS-485, with connection cable AKB161 or AKB162, maximum transmission distance is 1200m. Dual-redundant communication is available by installing two communication modules.
2. Standard Specification
Main Characters | Description |
Interface | RS-422/RS-485 |
Connection method | Point-to-point (RS-422), Multipoint (RS-485) |
Synchronization method | 128 Mbps (I/O module data transmission) |
Transmission distance | Start-stop synchronization |
Transmission speed | 1200/2400/4800/9600/19200/38400 bps (depends on communication function, subsystems, and connection method) |
Transmission code | ASCII/binary |
Transmission distance | Maximum 1200 m (total extended length) |
I/O wiring | Cable with 3-pair shield, AKB161, or AKB162 |
Current consumption | 0.5 A |
3. Model Selection of ALR121 Serial Communication Module
Model | Suffix Codes | Description | ||
ALR121 | Serial Communication Module (RS-422/RS-485, 2-port for N-IO/FIO) | |||
-S | Standard type | |||
5 | Standard type with no explosion protection | |||
E | Standard type with explosion protection | |||
0 | Basic type | |||
1 | With ISA Standard G3 option | |||
3 | With ISA Standard G3 option and temperature (-20 to 70 °C) option | |||
4. Typical Order Codes
Typical order codes | Remarks |
ALR121-S50 | Basic type |
ALR121-S51 | With ISA Standard G3 option |
ALR121-S53 | C With ISA Standard G3 option with wide temperature (-20 to 70 °C) |
5.Dual-redundant Configuration
6. External Dimension
