As an OT administrator, it is important to understand how industrial protocols work in an OT network. Which communication method is used by the Modbus protocol?
A.
It uses OSI Layer 2 and the primary device sends data based on request from secondary device.
B.
It uses OSI Layer 2 and both the primary/secondary devices always send data during the communication.
C.
It uses OSI Layer 2 and both the primary/secondary devices send data based on a matching token ring.
D.
It uses OSI Layer 2 and the secondary device sends data based on request from primary device.
D.
Modus is an open protocol used in an OT network. Modus uses primary/secondary communication in which the secondary device will not transmit data without getting an offer from the primary device. The Modus protocol cannot be used for real-time data transmission.
Modbus devices communicate using a master-slave (client-server)
technique in which only one device (the master/client) can initiate
transactions (called queries). The other devices (slaves/servers) respond
by supplying the requested data to the master, or by taking the action
requested in the query. A slave is any peripheral device (I/O transducer,
valve, network drive, or other measuring device) which processes
information and sends its output to the master using Modbus. The Acromag
I/O Modules form slave/server devices, while a typical master device is a
host computer running appropriate application software. Other devices may
function as both clients (masters) and servers (slaves).
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2 months, 2 weeks agoSpippolo
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