4500/720 Series 720 Family Models 4513, 4514 Group User's Manual

4513/4514 Group User’s Manual
HARDWARE
1-55
Fig. 38 State transition
Fig. 39 Set source and clear source of the P flag Fig. 40 Start condition identified example using the SNZP in-
struction
S
R
Q
Power down flag P
POF instruction
Reset input or
voltage drop detection
circuit output
● Set source POF instruction is executed
● Clear source Reset input
• • • • • • •
• • • • • •
Software start
P = “1”
?
Yes
Warm start
Cold start
No
: Time required to stabilize the f(X
IN) oscillation is automatically generated by hardware.
Stabilizing time a
POF instruction
is executed
A
f(X
IN) oscillation
Return input
(Stabilizing time a )
B
(RAM back-up
mode)
f(X
IN) stop
Reset
(Stabilizing time a )
FUNCTION BLOCK OPERATIONS