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8 Examples of Practical Programs
8.2 Example of Program using Useful Functions
A
Common Items
B
FX
3U
-4AD
FX
3UC
-4AD
C
FX
3U
-4AD-ADP
D
FX
3G
-2AD-BD
E
FX
3U
-4DA
F
FX
3U
-4DA-ADP
G
FX
3G
-1DA-BD
H
FX
3U
-3A-ADP
I
FX
3U
-4AD-PT
-ADP
J
FX
3U
-4AD-PTW
-ADP
FX
3G
/FX
3U
/FX
3UC
PLC User's Manual - Analog Control Edition
FX3U-4DA (4-channel Analog Output)
8.2 Example of Program using Useful Functions
This section describes a practical program that uses the disconnection detection function (BFM #28), upper/
lower limit function (BFM #38 to #48), corrective function by load resistance (BFM #50 to #54) and status
automatic transfer function (BFM #60 to #63) of FX
3U-4DA.
1. Conditions
The sequence program described in this section is created under the following conditions.
1) System configuration
FX
3U-4DA (unit No.0) should be connected to the FX3U Series PLC.
2) Output mode
Channels 1 and 2 should be set to mode 0 (voltage output, -10 V to +10 V).
Channels 3 and 4 should be set to mode 2 (current output, 0 mA to 20 mA).
3) Convenient functions
The disconnection detection function, upper/lower limit function, corrective function by load resistance
and status automatic transfer function are used.
4) Device assignment
Device Description
Input
X000 Clearance of upper/lower limit function status data
X001 Clearance of error status data
X002 Clearance of disconnection detection status data
D10 Data to be output from channel 1
D11 Data to be output from channel 2
D12 Data to be output from channel 3
D13 Data to be output from channel 4
Output
Y000 Output of channel-1 lower limit error data
Y001 Output of channel-1 upper limit error data
Y002 Output of channel-2 lower limit error data
Y003 Output of channel-2 upper limit error data
Y004 Output of channel-3 lower limit error data
Y005 Output of channel-3 upper limit error data
Y006 Output of channel-4 lower limit error data
Y007 Output of channel-4 upper limit error data
Y010 Output of disconnection detection signal
Y011 Output of error detection signal
D200 Data register at destination of automatic transfer of error status
D201
Data register at destination of automatic transfer of upper/lower limit
function error status
D202
Data register at destination of automatic transfer of disconnection detection
error status