Description
Brand： Yokogawa Model number：ALR121-S51
Colour：new Warranty: 12 months
Lead Time：3-day working day Country of origin: Japan
Price: Please contact us Product weight: 2.0kg
Product Dimensions：
This document describes about 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 SSC60, SSC50, and SSC10 safety control units and
SNB10D safety node unit that are connected with safety control units by ESB bus
Modbus slave communication function enables ProSafe-RS a Modbus communication where an SCS acts as a
Modbus slave and communicates with a Modbus master which is a different system from ProSafe-RS.
Relationship between SCS and Modbus Master
Communication module’s definition information, Modbus device addresses, mapping definition of SCS data, and so on
are to be downloaded using engineering function of a Safety Engineering Station (SENG).
When a data is sent from an external Modbus master (external device), the SCS’s CPU receives it through its serial
communication module. The SCS’s CPU sends a response message using the Modbus slave communication function
to the Modbus master in response to the data request. The SCS Maintenance Support Tool displays error information
and notifies the error status using the SCS status display function when an error in the serial communication module
and communication content occurs
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