Hitachi CONVENTION 14 Instruction Manual page 202

Network Detection Signal (FieldBus Option)
The Network Detection Signal output indicates the general status of network
communications when using a FieldBus option. The inverter has a programmable
watchdog timer to monitor network activity. Parameter P044 sets the time-out period. If
communications stop or pause longer than the specified time-out period, the ODc output
turns ON.
Option Terminal
Code Symbol
10 ODc Network
Disconnection
Signal
(Option module)
Valid for inputs: 11, AL0 – AL2
Required settings P044, P045
Notes:
To disable the communications watchdog timer,
set P044=00.00 sec.
Function Name State
ON
OFF
Description
when the communication watchdog timer (period
specified by P044) has timed out.
when the communication watchdog timer is
satisfied by regular communications activity
Example for terminal [11] (default output
configuration shown – see
Inverter output
terminal circuit
CM2
Example for terminal [AL0], [AL1], [AL2] (requires
output configuration – see
Inverter logic
circuit board
AL0 AL1
Power
supply
See I/O specs on page 4-6
4 − 53
4 53
page 3-54):
ODc
11
RY
page 4-35 and 3-54):
ODc
AL2
Load