VAT 642 Series - CC-Link Interface Commands; CC-Link Handshaking

INSTALLATION Series
642
60/107 Edition 2017-11-24 813316EB
4.8 CC-Link interface commands
4.8.1 CC-Link Handshaking
Before the CC-Link slave station (VAT valve) can be operated by the CC-Link Master (PLC), handshaking
is necessary. If the handshake is not done, no data from the master will be transmitted to station.
An indication of a successful handshaking is the bit «FIELDBUS DATA VALID» (= 1) in the input buffer >
GENERAL STATUS.
The CC-Link “Network failure” is independent of the CC-Link handshaking. That means the “Network
failure” is inactive if the handshaking is not done yet.
Procedure:
1. If the network
parameter are
correct the slave
station will set the
bit ’Initial data
processing
request flag’.
2. The master have
to answer the
request with the
bit ’Initial data
processing
complete flag’.
3. Now the station
sets the
bit ’Remote
READY’. That
means the normal
operation mode.
The Flag ‘Remote READY’ from slave station must be set for normal operation.
Master PLC
Slave station
VAT Valve
Remote READY flag
InitialDataProcessingRequest flag
InitialDataProcessingComplete flag
Master PLC Slave Station
VAT Valve