Bfm #39: Upper/Lower Limit Function Status - Mitsubishi FX3U-4AD User Manual

FX /FX /FX PLC User's Manual - Analog Control Edition
3G 3U 3UC
FX -4DA (4-channel Analog Output)
3U

5.4.14 BFM #39: Upper/lower limit function status

When any of the output data (BFM #1 to #4) is out of range between the lower limit and the upper limit (BFM
#41 to #48), the relevant bit is turned on.
1. Assignment to each bit of BFM #39
Bit
b0 Data output from channel 1 < Lower limit (BFM #41)
b1 Data output from channel 1 > Upper limit (BFM #45)
b2 Data output from channel 2 < Lower limit (BFM #42)
b3 Data output from channel 2 > Upper limit (BFM #46)
b4 Data output from channel 3 < Lower limit (BFM #43)
b5 Data output from channel 3 > Upper limit (BFM #47)
b6 Data output from channel 4 < Lower limit (BFM #44)
b7 Data output from channel 4 > Upper limit (BFM #48)
b8 to b15 Not used
2. Cautions regarding use of the upper/lower limit function status
• The ON bits of the upper/lower limit function status are latched after the output data has returned to the
specified ranges between the upper and lower limits.
• The upper/lower limit function status can be reset by the following methods.
- Use the upper/lower limit function status reset function (BFM #40).
- Turn the power supply off then on.
3. Upper/lower limit automatic transfer function (b1 of BFM #60)
If the upper/lower limit automatic transfer data register is specified in BFM #62, the data in BFM #39 can be
transferred to a specified data register.
Only when an error is detected, data will be automatically transferred from the FX
reason, the PLC does not need the program for reading data, and the scan time of the PLC can be shortened.
→ For a detailed description of the status automatic transfer function, refer to Subsection 5.4.18.
5.4.15 BFM #40: Clearance of upper/lower limit function status
The flags can be reset by turning on the following bits of BFM #40.
1. Assignment to each bit of BFM #40
Bit
b0
b1
b2 to b15
2. Operation to be performed after resetting
At the completion of status reset, the bits of BFM #40 will automatically turn off.
Description
Description
Clearance of lower limit status
Clearance of upper limit status
Invalid
5 Buffer Memory (BFM)
5.4 Buffer Memory Details
Initial value: H0000
Numeric data type: Hexadecimal (H)
-4DA to the PLC. For this
3U
Initial value: H0000
Numeric data type: Hexadecimal (H)
A
B
C
D
E
F
G
H
I
J
E-31