Mitsubishi Electric FR-E700 Instruction Manual page 444

Communication operation and setting
Ethernet signal loss detection function selection (Pr. 851)
● Use Pr. 851 to set the operation when the Ethernet communication is interrupted by physical
factors including disconnection of the Ethernet cable or damages on the Ethernet cable.
● When an Ethernet communication error is detected while Pr. 851 = "2 or 3 (initial value)", the alarm
(LF) signal is output via an output terminal of the inverter. For the LF signal, set "98 (positive logic)
or 198 (negative logic)" in any of Pr. 190 to Pr. 192 (Output terminal function selection) to assign
the function to the output terminal.
Pr. 851
0
2
3 (initial value)
Tab. 6-110: Settings of Pr. 851
Ethernet communication check time interval (Pr. 852)
● Set the communication check (signal loss detection) interval in Pr. 852 (initial value: 1.5 seconds)
for the inverter and all other devices with IP addresses in the range specified for Ethernet
command source selection (Pr. 844 to Pr. 849). If a nocommunication state persists for the
permissible time or longer, the Ethernet communication fault (E.OP1) is activated and the inverter
output is shut off.
● When "9999" is set in Pr. 852, the communication check (signal loss detection) will not be
performed.
● The monitored items and parameter settings can be read via Ethernet when "0" is set in Pr. 852,
but the Ethernet communication fault (E.OP1) is activated instantly when the operation mode is
switched to the Network operation.
● A signal loss detection is made when any of 0.1 s to 999.8 s is set in Pr. 852. In order to enable the
signal loss detection, data must be sent by connected devices at an interval equal to or less than
the time set for the communication check. (The inverter makes a communication check (clearing
of communication check counter) regardless of the station number setting of the data sent from
the master.)
● Communication check is started at the first communication when the inverter operates in the
Network operation mode and the command source is specified as communication via the Ether-
net connector.
Example When Pr. 852 = 0.1 to 999.8 s
Operation mode
Connected device
Inverter
Inverter
Connected device
Communication
check counter
E.OP1
Fig. 6-143: Timing of the Ethernet communication check
6 - 290
Description
Detection disabled
Alarm output
Protective function (E.OP1)
External Network
Check starts
Pr. 852
Operation panel display/
indicator
—
—
E.OP1
OFF
Parameter
LF signal output
No
Yes
Yes
Fault (E.OP1)
Time
ON
I004013E