YOKOGAWA FVX110, User Manual

Page: 35 / 168

<5. Installation>
5-4
IM 01S01C01-01EN
Field device
Fieldbus power
supply
Terminator
Terminator
FVX110
HOST
F0506.ai
Figure 5.6 Cabling
F0507.ai
–
Power supply and output terminals
Ground terminal
1
2
1
Terminal
2
Terminal
Figure 5.7 Wiring Diagram
CAUTION
Connectiong with the commercial AC power
supply will damage the device. Be sure to use a
dedicated power supply for Filedbus.
NOTE
No CHECK terminal is used for FVX110. Do not
connect anything on CHECK terminal.
Before using a Fieldbus configuration tool other
than the existing host, confirm it does not affect the
loop functionality in which all devices are already
installed in operation. Disconnect the relevant
control loop from the bus if necessary.
IMPORTANT
Connecting a Fieldbus configuration tool
to a loop with its existing host may cause
communication data scrambling resulting in a
functional disorder or a system failure.
5.6 Host Setting
To activate Fieldbus, the following settings are
required for the host.
IMPORTANT
Do not turn off the power immediately after
setting. When the parameters are saved to the
EEPROM, the redundant processing is executed
for an improvement of reliability. If the power
is turned off within 60 seconds after setting is
made, the modified parameters are not saved
and the settings may return to the original values.
Table 5.1 Operation Parameters
Symbol Parameter Description and Settings
V (ST) Slot-Time Indicates the time
necessary for immediate
reply of the device. Unit of
time is in octets (256 μs).
Set maximum
specification for all
devices. For FVX110, set
a value of 4 or greater.
V (MID) Minimum-Inter-
PDU-Delay
Minimum value of
communication data
intervals. Unit of time is in
octets (256 μs). Set the
maximum specification for
all devices. For FVX110,
set a value of 4 or greater.
V (MRD) Maximum-
Reply-Delay
The worst case time
elapsed until a reply is
recorded. The unit is
Slot-time; set the value
so that V (MRD) × V (ST)
is the maximum value of
the specification for all
devices. For FVX110, the
setting must be a value of
12 or greater.
V (FUN) First-Unpolled-
Node
Indicate the address next
to the address range used
by the host. Set 0 × 15 or
greater.
V (NUN) Number-of-
consecutive-
Unpolled-Node
Unused address range.