RS422 RS485 YOKOGAWA Transmitter Module ALR121-S00
Brand Name:YOKOGAWA
Certification:CE
Model Number:ALR121-S00
Minimum Order Quantity:1pc
Delivery Time:on request
Payment Terms:T/T
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YOKOGAWA RS422/RS485 Module ALR121-S00
Models ALR111 and ALR121 Serial Communication Modules used with a safety control station (SCS) for performing Modbus communication.
By using the SCS’s Modbus slave communication function, the data in SCS can be set or referred to by the Modbus master which is as separate system from SCS via a serial communication module. Furthermore, the subsystem
data such as from sequencers can be set or referred to via a serial communication module using SCS’s subsystem communication function.
These serial communication modules can be mounted on a safety control unit and a safety node unit.
Hardware specifications of ALR111 and ALR121 serial communication modules are as shown below. These modules are interference-free modules that have no interference with the safety loop.
Table Serial Communication Module Hardware Specifications
| Item | Specifications | |
| Model | ALR111 | ALR121 |
| Interface | RS-232C | RS-422/RS-485 (4-wire system) |
| Connection method | Point-to-point | Point-to-point (RS-422) Multipoint (RS-485) |
| Communication function | Half-duplex | |
| Synchronization method | Start-stop synchronization | |
| Transmission speed | 1200/2400/4800/9600/19200/38400 bps | |
| Transmission code | binary | |
| Character length | 8 bits (Fixed to 8 bit on the Modbus slave communication function and the subsystem communication function) | |
| Stop bit length | 1/2 bits (Fixed to 1 bit on the subsystem communication function) | |
| Parity check | None/even/odd | |
| Lag time after data transmission | 1 ms | |
| Transmission distance | Maximum 15 m | Maximum 1200 m (total extended length) |
| Installation method | Mounted on S2SC70 , SSC60 , SSC50 , SSC57 , or SNB10D | |
| I/O wiring | AKB131, AKB132, AKB135, AKB136 cables, etc. | Cable with 3-pair shield, AKB161, or AKB162 |
| Wiring connection | D-sub-9-pin (female × 2 ports) | Clamped with terminal block’s M4 screws (5 poles × 2 ports) |
| Communication function (*1) | Modbus slave communication function, subsystem communication function | |
| Current consumption | 0.5 A | 0.5 A |
| Weight | Approx. 0.3 kg | Approx. 0.34 kg |
*1: A unit of SCS is capable of handling multiple communication functions: however, different types of communication functions cannot be simultaneously performed on a serial communication module. It means that two ports must have identical
communication functions.
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RS422 RS485 YOKOGAWA Transmitter Module ALR121-S00
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