Buffer Memory Details - Mitsubishi Electric FX3G User Manual

FX /FX /FX /FX /FX
3S 3G 3GC 3U 3UC
FX -4DA (4-channel Analog Output)
3U
5.4

Buffer Memory Details

5.4.1 BFM#0: Output mode specification
Specify the output modes of channel 1 to 4.
4 hexadecimal digits are assigned to specify the output modes of the 4 channels.
Change the value of each digit to change the output mode of each channel. 0 to 4 and F can be set for each
digit.
H
ch4
ch3
The different types of output modes are shown in the following table:
Set value
[HEX]
0 Voltage output mode
Voltage output
*1
1
analog value mV specification mode
2 Current output mode
3 Current output mode
Current output
*1
4
analog value μA specification mode
5 to E Invalid (setting values unchanged)
F Channel not used
*1. The offset/gain values cannot be changed.
1. Cautions regarding output mode setting
• While the output mode is being changed, the output is stopped, and H0000 is automatically written in the
output status (BFM#6).
At the completion of change of the output mode, the output status (BFM#6) will automatically change to
H1111, and the output is restarted.
• It takes approximately 5 seconds to determine the output mode.
For this reason, after changing the output mode, be sure to wait for 5 seconds or more, and then write the
other data.
• When the output mode is changed, the settings in the following buffer memory are initialized according to
the new output mode.
- BFM#5 (output setting upon PLC stop)
- BFM#10 to #13 (offset data)
- BFM#14 to #17 (gain data)
- BFM#28 (disconnection detection status)
- BFM#32 to #35 (output data upon PLC stop)
- BFM#38 (upper/lower limit function setting)
- BFM#41 to #44 (lower limit values of upper/lower limit function)
- BFM#45 to #48 (upper limit values of upper/lower limit function)
- BFM#50 (Setting of output corrective function by load resistance)
*2 FX -4DA initializes the corresponding bit to the channel where the user has changed the output mode.
3U
*3 FX -4DA initializes the corresponding buffer memory to the channel where the user has changed the
3U
output mode.
*4 These settings are initialized only when the output mode is changed from current output mode
(mode 2, 3 or 4) to voltage output mode (mode 0 or 1).
• HFFFF (use of no channels) cannot be set.
PLC User's Manual - Analog Control Edition
ch1
ch2
→ For a detailed description of output characteristics, refer to Section 2.4.
Output mode
*2
*3
*3
Numeric data type: Hexadecimal (H)
Analog output range
-10 V to +10 V
-10 V to +10 V
0 mA to 20 mA
4 mA to 20 mA
0 mA to 20 mA
-
*4
*3
*2
*3
*3
*2
5 Buffer Memory (BFM)
5.4 Buffer Memory Details
Initial value (at delivery): H0000
Digital input range
-32000 to +32000
-10000 to +10000
0 to 32000
0 to 32000
0 to 20000
-
E-21
A
B
C
D
E
F
G
H
I
J