Mitsubishi Electronics FR-A700 Data read timing chart, Operation mode setting read D9140

Inverter Status Monitoring, Special Registers for Control

1.7.2Data that are read by controlling (OFF to ON) the read

command

You can read the operation mode and set frequency of the inverter.

Device	Name	Read	Write	Data Access
No.		Command	Completion	Enable Condition
D9140	Operation mode setting read	Y20	X20	Always
D9141	Set frequency read (RAM)	Y21	X21
D9142	Set frequency read (EEPROM)	Y22	X22

Data are stored into the above data devices as soon as the read completion turns from off to on after the read command has turned from off to on.

If the read command remains on, data is not refreshed. (Data is not updated.) Turn the device off once, then on again to refresh data.

Data read timing chart

	3) In user sequence, ON of read completion
1) Read command is turned	is confirmed and data is read from special
on in user sequence.	register and processed.	4) After completion of read,
		read command is turned off.
Y2n(n=0 to 2)
Read command
X2n(n=0 to 2)
Read completion
D914n(n=0 to 2)
Read data
User sequence
processing
2) Inverter CPU stores inverter data		5) Inverter CPU confirms that
into special register and turns on		read command is off and
read completion.		turns off read completion.

(1) Operation mode setting read (D9140)

Data Setting	Operation Mode
H0000	NET operation mode
H0001	External operation mode
H0002	PU operation mode

REMARKS

When the Pr. 79 "operation mode selection" setting is other than "0", the operation mode is as set. However, when Pr. 79 = "3" or "4", the operation mode is "H0002" (PU operation mode).

<Operation mode setting read program example>

The following program reads the operation mode data to D0.

1

PLC FUNCTION

Operation mode read setting request

Turns on operation mode read request pulse.

Stores operation mode data to D0 when operation mode setting read completion signal turns on.

Turns on operation mode setting read command. (Until operation mode setting read completion signal turns on)

23