6 Programming Features
143
Procedure for Communications with PLC
The following shows the procedure for communications with a PLC.
1. Connect the communication cable between the PLC and the V7AZ
with the power supply turned OFF.
2. Turn the power ON.
3. Set the constants (n151 to n157) required for communication by
using the Digital Operator.
4. Turn the power OFF once to verify that the Digital Operator displays
have been completely erased.
5. Turn the power ON again.
6. Communications with the PLC starts.
Setting Constants Necessary for Communication
Communication related constants must be set for PLC communication.
Constants n151 to n157 cannot be set by communication. Always set
them before performing communication.
Constant Name Description Factory
Setting
n003 Run Command
Selection
0: Digital Operator
1: Control circuit terminals
2: MEMOBUS communications
3: Communications card (optional)
0
n004 Frequency Refer-
ence Selection
0: Potentiometer (Digital Operator)
1: Frequency reference 1 (n024)
2: Control circuit terminals (voltage 0 to 10 V)
3: Control circuit terminals (current 4 to 20 mA)
4: Control circuit terminals (current 0 to 20 mA)
5: Pulse train
6: MEMOBUS communication (register No. 0002H)
7: Operator circuit terminals CN2(voltage 0 to 10 V)
8: Operator circuit terminals CN2(current 4 to 20 mA)
9: Communication card (optional)
0
n151 MEMOBUS
Timeover Detec-
tion Monitors
Transmission
Time between
Receiving the
Correct Data from
the PLC.
(Timeover: 2 s)
0: Timeover detection (coast to a stop)
1: Timeover detection (decelerates to a stop with
speed deceleration time 1)
2: Timeover detection (decelerates to a stop with
speed deceleration time 2)
3: Timeover detection (continuous operation, warning
display)
4: Timeover detection not provided
0
n152 MEMOBUS
Frequency
Reference and
Frequency
Monitor Unit
0: 0.1 Hz
1: 0.01 Hz
2: 30000/100 % (30000=max.output frequency)
3: 0.1 %
0
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