Toshiba V Series Operation Manual page 19

Software configuration
Software configuration realizes the transmission operation of EN*** module is as
follows.
• Function Block:
Controller user programs perform the Ethernet transmission using function
blocks. There are mainly two transmission function blocks that perform sending
operation and receiving operation called USEND_T, and URCV_T, respectively.
And application programs are constructed using these function blocks.
• TCP: Transmission Control Protocol
This protocol performs transmission by establishing the connection (virtual
communication circuit) before transmitting with destination node. Transmission
reliability is raised by packet sequence control, packet retransmission, flow
control, and so on.
• UDP: User Datagram Protocol
This protocol performs transmission per datagram unit. It is possible to fast
transmit, because no connection is needed. However, not having the control
function like data retransmission, implementation is needed in the upper layer
program.
• IP: Internet Protocol
This protocol performs datagram type transmission. Data is transmitted per
datagram unit based on IP addresses. Unicast, broadcast, and multicast
transmission are supported.
• 10BASE5
Transmission speed is 10Mbps. Max 500 m per segment. Bus topology.
• 10BASE2
Transmission speed is 10Mbps. Max 185 m per segment. Bus topology.
• 100BASE-TX
Transmission speed is 100Mbps. Max 100 m per segment. Star topology.
• 10BASE-T
Transmission speed is 10Mbps. Max 100 m per segment. Star topology.
6F8C0878
V controller user program
Controller
module
V controller firmware
Ethernet
module
Function Block
(USEND_T, URCV_T)
Station bus
EN*** firmware
SNMP
TCP/UDP/IP
10BASE5, 10BASE2
100BASE-TX/10BASE-T
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