Modicon Quantum 140ATI03000 Analog Input Module

Modicon Quantum 140ATI03000 Analog Input Module Description:

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Modicon Quantum 140ATI03000  Analog Input Module

Modicon Quantum 140ATI03000  Analog Input Module

Modicon Quantum 140ATI03000  Analog Input Module

Figure 1 shows how devices might be interconnected in a hierarchy of networks that employ widely differing communication techniques. In message transactions, the Modbus protocol imbedded into each network’s packet structure provides the common language by which the devices can exchange dat

Transactions on Modbus Networks Standard Modbus ports on Modicon controllers use an RS–232C compatible serial interface that defines connector pinouts, cabling, signal levels, transmission baud rates, and parity checking. Controllers can be networked directly or via modems. Controllers communicate using a master–slave technique, in which only one device (the master) can initiate transactions (called ‘queries’). The other devices (the slaves) respond by supplying the requested data to the master, or by taking the action requested in the query. Typical master devices include host processors and programming panels. Typical slaves include programmable controllers. The master can address individual slaves, or can initiate a broadcast message to all slaves. Slaves return a message (called a ‘response’) to queries that are addressed to them individually. Responses are not returned to broadcast queries from the master. The Modbus protocol establishes the format for the master’s query by placing into it the device (or broadcast) address, a function code defining the requested action, any data to be sent, and an error–checking field. The slave’s response message is also constructed using Modbus protocol. It contains fields confirming the action taken, any data to be returned, and an error–checking field. If an error occurred in receipt of the message, or if the slave is unable to perform the requested action, the slave will construct an error message and send it as its response.

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