
1.I/O LINK-II I/O FUNCTION SPECIFICATIONS B-62714EN/04
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1.5 GLOSSARY
Key terms used this manual are explained below.
OPCN-1 (formerly called JPCN-1 or JEMA net)
Field network defined by the Japan Electrical Manufacturer's
Association
OPCN-1 certified device
FANUC device that passed the OPCN-1 certification test
Certification number: J990705JPCNM026
Date of certification: July 5, 1999
Master station
Station that establishes and cancels logical communication paths to
multiple slave stations, manages the data transmission service issue
sequence and error recovery sequence, and performs I/O transfer.
One OPCN-1 network can include only one master station.
Slave station
Station that exercises communication control and performs I/O
transfer to and from the master station according to instructions from
the master station. One OPCN-1 network can include up to 31 slave
stations.
Initialization service
Service defined by OPCN-1 for information exchange and setting to
establish logical communication paths between the master station and
slave stations. When the initialization service is executed successfully,
input/output service can be started.
Input/output service
Service defined by OPCN-1 for DI/DO data transfer between the
master station and slave stations
Reset service
Service defined by OPCN-1 for the master station to reset slave
stations to the initial state
Initial state
State where no logical communication path is established
Detachment
State where communication (input/output service being performed)
with the remote station is disabled
Disconnection
State where communication is not performed (such as in the initial
state or detached state)