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Parameter
Name
Number
Communication
122
check time
interval
Waiting time
123
setting
CR • LF
instruction
124
presence/
absence
2
E
PROM write
342*
selection
* When you have set write to RAM, powering off the inverter clears the parameter values that
have been changed. Therefore the parameter values available when power is switched on
again are those stored previously in E
When the parameter values will be changed frequently, set "1" in Pr. 342 to choose write to
RAM. Performing frequent parameter write with "E
2
E
PROM.
2
The Pr. 342 " E
PROM write selection" setting is also valid when the communication option is
fitted.
REMARKS
When parameter is set to without E
reset or terminal reset returns the setting value to the original value (value stored in
2
E
PROM).
<Computer programming>
(1) Communication protocol
Data communication between the computer and inverter is performed using the
following procedure:
Computer
Inverter
Inverter
Computer
*1. If a data error is detected and a retry must be made, execute retry operation with the
user program. The inverter comes to an alarm stop if the number of consecutive
retries exceeds the parameter setting.
*2. On receipt of a data error occurrence, the inverter returns "reply data 3)" to the
computer again. The inverter comes to an alarm stop if the number of consecutive
data errors reaches or exceeds the parameter setting.
Setting
0
No communication
Set the communication check time [seconds] interval.
0.1 to
If a no-communication state persists for longer than the
999.8
permissible time, the inverter will come to an alarm stop.
9999
Communication check suspension
Set the waiting time between data transmission to the
0 to 150
inverter and response.
9999
Set with communication data.
0
Without CR/LF
1
With CR, without LF
2
With CR/LF
When parameter write is performed from the
0
computer, parameters are written to E
When parameter write is performed from the
1
computer, parameters are written to RAM.
2
PROM.
↓ (Data flow)
*1
↓ (Data flow)
Description
2
PROM write" set will shorten the life of the
2
PROM write (Pr.342="1"), performing power
Data read
*2
1)
4)
2)
3)
Data write
126
PARAMETERS
2
PROM.
5)
Time
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