IDEC FC4A-C10R2 User Manual page 407

Changing Analog Output While CPU is Stopped
When using the FC4A-K2C1 analog output module, the analog output value can be changed while the CPU module is
stopped. To change the analog output value, store a required output value to the memory addresses allocated to the analog
output data.
Example: Memory Allocation of Ladder Refresh Type Analog Output Module FC4A-K2C1
Memory Address
(data address used for STPA)
+20
+22
STPA instruction when FC4A-K2C1 is mounted on slot 4
Ladder Diagram
M8120
STPA(I) DATA
WRITE D1400
Note: The above ladder diagram is only an example and should be modified as required.
Precautions for Programming ANST Macro
When using the ANST macro, do not make a branch from the ladder line of the ANST macro.
M8120
Incorrect
Delete the branch from the ANST macro, and start another line by inserting a LOD instruction.
M8120
Correct
M8120
Data Size
(bytes)
2
2
MOV(I) S1 – D1 R
0 D1400
STATUS SLOT ADDRESS
D1500 4 20
ANST
ANST
« FC4A M
ICRO
R/W
R/W
Analog Output Data
R/W
M8120 is the initialize pulse special internal
REP
2
relay.
MOV stores output values at the OFF state.
BYTE
4
When the CPU stops, STPA updates the analog
output value of the analog output module.
NO.1
J8AT1
Q1
NO.1
J8AT1
Q1
S U ' M »
MART SER S ANUAL
24: A I/O C
NALOG ONTROL
Parameter
CH0
CH1
24-21