SM-Ethernet User Guide
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LSB:
Least Significant Bit/Byte.
MAC address:
This is a unique address that is assigned to SM-Ethernet at the time of
manufacture. No other device will have this address. The address is used to make
connections to the module before the IP address is assigned.
MBAP:
Modbus application protocol. This is a 7 byte header added to the main Modbus
telegram (PDU) which contains IP specific identifiers.
Modbus IP:
A protocol that allows Modbus to be sent over TCP/IP. The modbus
protocol allows manipulation of the parameters within the host drive and SM-Ethernet.
MSB:
Most Significant Bit/Byte.
Node:
A device on the network. This may be either a device such as a drive or part of
the network such as a repeater.
Non-crossover lead:
See
Patch lead
.
Non-cyclic (explicit) data:
Data that is requested or sent as required and not on a
regular basis. Sometimes referred to as “Explicit data”.
Octet:
A collection of 8 binary digits which form a byte.
Patch lead:
A network cable where the terminal connections at one end of the cable are
connected straight through to the other end on a pin to pin basis. Normally used to
connect a network device to a network switch.
PC:
Personal Computer.
PDU:
Protocol Data Unit. This is the main Modbus message telegram, to which is added
the MBAP header to form the complete Modbus telegram.
PLC:
Programming Logic Controller.
Poll rate:
The rate at which cyclic data is sent and received on the network.
Polled data:
See
Cyclic data
.
RPI:
Requested Packet Interval. Specifies the expected time for the device to respond
to a request.
Router:
A device that is used to connect different networks or subnets, in a similar way
to a firewall, however a router generally allows significantly less control of the data.
Scan rate:
See
Poll rate
.
Shielding:
A connection to provide additional immunity to noise used on a network
cable.
SMTP:
Simple Mail Transfer Protocol. A protocol used for sending email.
Summary of Contents for SM-Ethernet
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