Unit_AnalogInOut_FP0_A21

Function to write to and read from an FP0-A21 unit.

This function writes digital data to the analog output channel of the analog unit and reads converted digital data from its analog input channels. The digital values to be converted and output as analog values are specified at iOutChannel. The converted digital values from the analog unit are stored per channel in the output variables iInChannel0 and iInChannel1.

The analog value ranges must be set with the DIP switches.

Parameters

Input

iIOWordOffset (INT)

Set the offset of the first WX/WY address of the analog unit according to its installation position.

For analog expansion units connected directly to the CPU (without adapter): Use ExpansionUnitToIOWordOffset_FP0 or make the following settings: 2 (WX2/WY2) for unit number 1, 4 (WX4/WY4) for unit number 2, 6 (WX6/WY6) for unit number 3

For analog expansion units connected to the CPU via an adapter: Use ExpansionUnitToIOWordOffset_FPX_FP0 or select the offset from the table.

Unit position relative to the adapter	Adapter position relative to the CPU
Unit position relative to the adapter	1st unit	2nd unit	3rd unit	4th unit	5th unit	6th unit	7th unit	8th unit
1st unit	30	40	50	60	70	80	90	100
2nd unit	32	42	52	62	72	82	92	102
3rd unit	34	44	54	64	74	84	94	104

iOutChannel (INT)

Set the digital value to be converted and output by the analog unit.

Values:

For -10.0 to +10.0V: -2000 to +2000
For 0.0 to 20.0mA: 0 to 4000

Output

iInChannel0, iInChannel1 (INT)

Returns the converted digital data from the analog unit by channel.

Values:

For 0 to 5V, 0 to 20mA: 0 to 4000 (depending on wiring method)
For -10 to +10V, -100 to 100mV: -2000 to +2000
For 25 to 1000°C: 25 to 1000
For 0 to -100°C: 0 to -100

DIP switch settings

The DIP switch settings will become effective when the power is turned from OFF to ON.

Input range and averaging:

No averaging: Conversion data is set for the specified input contact point area for each A/D conversion, on each channel.

Averaging: On each channel, for each A/D conversion, the maximum and minimum values from the data of the last ten times are excluded, the data from the other eight times is averaged and the result is set.

	0 to 5V, 0 to 20mA		-10 to +10V
	No averaging	Averaging	No averaging	Averaging

Thermocouple input range:

For thermocouples, averaging is always performed.

Thermocouple type K

Terminal temperature to 1000°C

-100°C to terminal temperature
Thermocouple type J

Terminal temperature to 750°C

-100°C to terminal temperature
Thermocouple type T

Terminal temperature to 350°C

-100°C to terminal temperature

Output range:

	0 to 20mA	-10 to +10V

Input wiring

Voltage input	Current input
Connect the input instrument between the IN/V and IN/COM terminals.	Connect the IN/V and IN/I terminals. Connect the input instrument between the bridge and the IN/COM terminal.

Thermocouple input
Temperature higher than terminal temperature: Connect the IN/V terminal to the (+) side of the thermocouple. Connect the IN/COM terminal to the (-) side of the thermocouple.	Temperature lower than terminal temperature: Connect the IN/V terminal to the (-) side of the thermocouple. Connect the IN/COM terminal to the (+) side of the thermocouple.

Thermocouple input

Temperature higher than terminal temperature:

Connect the IN/V terminal to the (+) side of the thermocouple. Connect the IN/COM terminal to the (-) side of the thermocouple.

Temperature lower than terminal temperature:

Connect the IN/V terminal to the (-) side of the thermocouple. Connect the IN/COM terminal to the (+) side of the thermocouple.

Output wiring

Voltage output	Current output
Connect the output instrument between the OUT/V and OUT/COM terminals.	Connect the output instrument between the OUT/I and OUT/COM terminals.

Conversion characteristics

0mA to 20mA input or output		0V to 5V DC input		-10V to 10V DC input or output
Digital value (INT)	Analog value	Digital value (INT)	Analog value	Digital value (INT)	Analog value
0	0.0mA	0	0.0V	-2000	-10.0V
800	4.0mA	400	0.5V	-1500	-7.5V
1600	8.0mA	800	1.0V	-1000	-5.0V
2400	12.0mA	1200	1.5V	-500	-2.5V
3200	16.0mA	1600	2.0V	0	0.0V
4000	20.0mA	2000	2.5V	+500	+2.5V
		2400	3.0V	+1000	+5.0V
		2800	3.5V	+1500	+7.5V
		3200	4.0V	+2000	+10.0V
		3600	4.5V
		4000	5.0V

Thermocouple input:

Above terminal temperature		Below terminal temperature
Digital value (INT)	Analog value	Digital value (INT)	Analog value
25	25°C	0	0°C
250	250°C	-25	-25°C
350	350°C	-50	-50°C
500	500°C	-75	-75°C
750	750°C	-100	-100°C
1000	1000°C

Tip

This command description provides basic hardware documentation only. For detailed technical information, consult the manual:

FP0-A21 Analog I/O Unit Technical Manual

Example

POU header

All input and output variables used for programming this function have been declared in the POU header. The same POU header is used for all programming languages.

	VAR
		iOutChannel: INT:=0;
		iIOWordOffset: INT:=0;
		iInChannel0: INT:=0;
		iInChannel1: INT:=0;
	END_VAR

LD body

Use ExpansionUnitNumberToIOWordOffset_FP0 or ExpansionUnitNumberToIOWordOffset_FPX_FP0 to calculate the word offset of the analog unit connected to the CPU.

BODY
    WORKSPACE
        NETWORK_LIST_TYPE := NWTYPELD ;
        ACTIVE_NETWORK := 0 ;
    END_WORKSPACE
    NET_WORK
        NETWORK_TYPE := NWTYPELD ;
        NETWORK_LABEL :=  ;
        NETWORK_TITLE :=  ;
        NETWORK_HEIGHT := 5 ;
        NETWORK_BODY
B(B_F,Unit_AnalogInOut_FP0_A21!,,25,1,38,5,,?DiIOWordOffset?DiOutChannel?CiInChannel0?CiInChannel1);
B(B_VARIN,,iOutChannel,23,3,25,5,);
B(B_VAROUT,,iInChannel0,38,2,40,4,);
B(B_VAROUT,,iInChannel1,38,3,40,5,);
B(B_VARIN,,1,3,2,5,4,);
B(B_F,ExpansionUnitNumberToIOWordOffset_FP0!,,5,1,25,4,,?DiExpansionUnitNumber?C);
L(1,0,1,5);
        END_NETWORK_BODY
    END_NET_WORK
END_BODY

ST body

Unit_AnalogInOut_FP0_A21(iIOWordOffset := iIOWordOffset,
                        iOutChannel := iOutChannel,
                        iInChannel0 => iInChannel0,
                        iInChannel1 => iInChannel1);