Mitsubishi Electronics FX2NC-4AD 8.Example program, 7.Adjustment of I/O Characteristics, Condition, Input mode:, I/O assignment:, Example program, I/O characteristics:, Convenient function:

BFM #200 to BFM #1799: Data history

The A/D conversion value of each channel is sampled, and written to the BFMs shown below. The table below shows the assignment between the channel No. and the BFM No. Data is stored in ascending order of the BFM No.

Up to 400 data history items are written for each channel. When the number of history items exceeds 400, the data is overwritten starting from the smallest BFM No.

The data history function is valid only for channels whose number of averaging times (BFM #2 to #5) is set to "1" and digital filter setting (BFM #6 to #9) is set to "0".

Assignment of channel No. and BFM No.

Channel			BFM No.
No.	1st value	2nd value	3rd value	• • • • •	400th value
CH1	#200	#201	#202	• • • • •	#599
CH2	#600	#601	#602	• • • • •	#999
CH3	#1000	#1001	#1002	• • • • •	#1399
CH4	#1400	#1401	#1402	• • • • •	#1799

• If a considerable amount of data history is read from the PLC main unit

using a FROM instruction, a watch dog timer error occurs in the PLC

main unit.

In such a case, divide the required data history using multiple FROM

instructions, and insert the WDT instruction (watch dog timer refresh

4.Current input, 4 to 20 mA, 0 to 4000

Digital value

4,000

0 4	20 Input current
	(mA)

6.Current input, -20 to 20 mA, -16000 to 16000

Digital value

16000

Input

current

(mA) -20

5.Current input, 4 to 20mA, 4,000 to 20,000

Digital value

20,000

4,000

0 4	20 Input current
	(mA)

7.Current input, -20 to 20 mA, -4000 to 4000

Digital value

4,000

Input

current

(mA) -20

8.Example program

This section introduces an example program to read analog data from the FX2NC-4AD and connecting to digital data in the PLC.

Condition

System configuration:

The FX2NC-4AD is connected as a special function block nearest to the FX2NC Series PLC main unit (unit No. 0).

Input mode:

CH1 and CH2: Mode 0 (voltage input, -10 to 10 V → -32000 to 32000)

CH3 and CH4: Mode 3 (current input, 4 to 20 mA → 0 to 16000) Number of averaging times: 1 (initial value) in each channel

I/O characteristics:

Standard I/O characteristics (initial value) in each channel Convenient function: Upper/lower limit value detection function is used.

Data history function:

Used while sampling time is set to 0ms (initial value).

CH1 to CH4: Sampling time = 1ms ⋅ 4 (Number of effective channels) = 4ms

I/O assignment:

X001	: Clears the upper/lower limit value error.
X002	: Clears the scale over error.

Y000 to Y017: Output the upper/lower limit value error status of each channel.

Y020 to Y037: Output scale over status of each channel.

Example program

T0						Reads the CH1 data
	FNC 78	K0	K200	D10	K10	history (for 10 times) to
	FROM
						D10 to D19.
						Refreshes the watch
	FNC 07
	WDT					dog timer.*1
						Reads the CH2 data
	FNC 78	K0	K600	D20	K10	history (for 10 times) to
	FROM					D20 to D29.
	FNC 07					Refreshes the watch
	WDT					dog timer.*1
						Reads the CH3 data
	FNC 78	K0	K1000	D30	K10	history (for 10 times) to
	FROM
						D30 to D39.
						Refreshes the watch
	FNC 07
	WDT					dog timer.*1
						Reads the CH4 data
	FNC 78	K0	K1400	D40	K10	history (for 10 times) to
	FROM					D40 to D49.
	FNC 07					Refreshes the watch
	WDT					dog timer.*1

END

1)The input mode setting will be kept by the EEPROM, therefore, continual channel settings is not needed after powering down.

instruction) after each FROM instruction.

7.Adjustment of I/O Characteristics

For factory default, the FX2NC-4AD has standard I/O characteristics in accordance with each input mode (BFM #0).

In the voltage and current input mode, adjust the standard I/O characteristics for each channel. (Do not change the input characteristics when 2, 5, 8 is set in BEM #0.)

7.1 Standard I/O characteristics

The input mode of the standard I/O characteristics is abbreviated as shown below:

0.Voltage input, -10 to 10V, -32,000 to 32000

	➁			➃
➀			➂
➀: Input mode set in BFM #0					➁	: Input mode
➂: Analog input range					➃	: Digital output range
0. Voltage input, -10 to 10 V,					1. Voltage input, -10 to 10 V,
	-32,000 to 32000					-4000 to 4000
		Digital value				Digital value

0 20

-16000

8.Current input, -20 to 20mA, -20,000 to 20,000

Digital value

20,000

Input

current

(mA) -20

0 20

-20,000

0 20

-4,000

Initial pulse

M8002
	FNC 79		K0	K0	H3300	K1
	TO
RUN monitor
M8000	TO
			K50
T0
	FNC 79		K0	K22	H0002	K1
	TO	P
	FNC 78		K0	K10	D0	K4
	FROM
	FNC 78		K0	K26	K4M0	K1
	FROM
Clear of
	FNC 78		K0	K28	K4M20	K1
upper/lower	FROM
limit value
error	FNC 78		K0	K29	D6	K1
	FROM
X001
	FNC 79		K0	K99	H0003	K1
	TO	P
Clear of scale over error

Specifies the input mode of CH1 to

CH4.1)

Stand by for five seconds.

Enables the upper/ lower limit value detection function.

Reads the channel data from CH1 to CH4.

(CH1 → D0, CH2 → D1, ..... CH4 → D3)

Reads the upper/lower limit value error status. (M0 to M15)

Reads the scale over status.(M20 to M35)

Reads the error status. (BFM #29 → D6)

Clears the upper/lower limit value error.

*1 When multiple data history items are read, the scan time of the PLC becomes longer.

In the FX2NC Series PLC, when the scan time exceeds 200 ms, the CPU error indicator lamp lights and the PLC stops.

When reading many data history items, divide data history items to be read using two or more FROM instructions, then insert the WDT (watch dog timer refresh) instruction between FROM instructions.

Approx. 32640				Approx. 4,080
			Approx. 10.2 V
	32000				4,000		Approx. 10.2 V
Input				Input
voltage				voltage	-10
(V)	-10			(V)
Approx.	10.2V	10		Approx. 10.2V		10

7.2 Adjustment of I/O characteristics

Adjust the I/O characteristics using the buffer memories in the FX2NC-4AD. Firstly, enter the input mode to BFM #0, then enter the offset data to BFM #41 to BFM #44, subsequently enter the gain data to BFM #51 to BFM #54.

Update the offset data and the gain data for each channel using BFM #21.

Example program (Adjustment of CH1, CH2 and CH4)

X002	FNC 79	K0	K28	K0	K1
	TO P
Lower limit value error of CH1
M0					Y0
Upper limit value error of CH1
M1

Clears the scale over error.

-			-32000		-			-4,000
			Approx. -32640					Approx. -4,080
2. Voltage input, -10 to 10V,					3. Current input, 4 to 20 mA,
	-10,000 to 10,000					0 to 16000
		Digital value				Digital value
	Approx. 10,200
				Approx. 10.2 V
		10,000
	Input					16000
voltage
		-10
	(V)
	Approx. -10.2 V		10
			-10,000
			Approx.
							0 4	20 Input current
			-10,200					(mA)

X000
	FNC 79		K0	K0	H1600	K1
	TO	P
Operation
start
	SET		M0
instruction
M0	TO		K50 *1
T0
	FNC 79		K0	K41	K0	K2
	TO	P
	FNC 79		K0	K51	K1250	K2
	TO	P
	FNC 79		K0	K44	K0	K1
	TO	P
	FNC 79		K0	K54	K10000	K1
	TO	P
	FNC 79		K0	K21	H000F	K1
	TO	P
	RST		M0

Specifies the input mode of CH1 to CH4.

Offset value of CH1 and CH2.

Gain value of CH1 and CH2.

Offset value of CH4.

Gain value of CH4.

Offset value and gain value of all channels at a time.

Y1

• • •

Upper limit value error of CH4

M7

Y7

Scale over error of CH1 (lower limit value)

M20

Y20

Scale over error of CH1 (upper limit value)

M21

Y21

• • •

Scale over error of CH8 (upper limit value) M27

Y27

Outputs the upper/ lower limit value error status of each channel.

Outputs the scale over error status of each channel.

*1 It takes approximately 5 seconds to change the input mode (BFM #0) (to change each set value).

Assure that a time interval of 5 seconds or more is held after a change of the input mode until execution of write of each setting (TO instruction).

•The I/O characteristics can be written (BFM #21) to either channel, or two or more channels simultaneously.

HEAD OFFICE	:	MITSUBISHI DENKI BLDG MARUNOUTI TOKYO 100-8310
HIMEJI WORKS	:	840, CHIYODA CHO, HIMEJI, JAPAN

When exported from Japan, this manual does not require application to the Ministry of Economy,

Trade and Industry for service transaction permission.

Specifications are subject to change without notice