Omron CPM1 Programming Manual

80
CPM1/CPM1A Interrupt Functions Section 1-6
Reset Methods
Either of the two methods described below may be selected for resetting the
PV of the count (i.e., setting it to 0).
Z-phase signal + software reset:
The PV is reset when the Z-phase signal (reset input) is turned ON while
the High-speed Counter Reset Bit (SR 25200) is ON.
Software reset:
The PV is reset when the High-speed Counter Reset Bit (SR 25200) is
turned ON.
Note The High-speed Counter Reset Bit (SR 25200) is refreshed once every cycle,
so in order for it to be read reliably it must be ON for at least one cycle.
The “Z” in “Z-phase” is an abbreviation for “Zero.” It is a signal that shows that
the encoder has completed one cycle.
High-speed Counter Interrupt Count
For high-speed counter 0 interrupts, a comparison table is used instead of a
“count up.” The count check can be carried out by either of the two methods
described below. In the comparison table, comparison conditions (for compar-
ing to the PV) and interrupt routine combinations are saved.
Target value:
A maximum of 16 comparison conditions (target values and count direc-
tions) and interrupt routine combinations are saved in the comparison ta-
ble. When the counter PV and the count direction match the comparison
conditions, then the specified interrupt routine is executed.
No. Operation timing Reset
(1) Z-phase signal turns ON when
SR 25200 turns OFF.
Not reset.
(2) Z-phase signal turns ON within one
cycle after SR 25200 turns ON.
Not reset.
(3) Z-phase signal turns ON after at least
one cycle elapses after SR 25200
turns ON.
Reset with Z-phase leading edge.
(4) Z-phase signal turns ON within one
cycle after SR 25200 turns OFF.
Reset with Z-phase leading edge.
(5) SR 25200 turns ON when Z-phase
signal is ON.
Not reset.
(1) (2) (3) (4) (5)
Z-phase
25200
CPU processing
1 cycle
Not reset Not reset Not resetReset
Reset
I/O refresh
Program
execution
Program
execution
Program
execution
Program
execution
Program
execution
Program
execution
Common processing,
communications servicing, etc.
Z-phase Signal + Software Reset

Omron CPM1 Specifications

General

Model	CPM1
Manufacturer	Omron
Instruction Set	Basic and advanced instructions
Power Supply	100 to 240 VAC or 24 VDC
Communication	RS-232C
I/O Points	10, 20, 30, or 40 points depending on the model
Timers	Yes, multiple timers available
Counters	Yes, multiple counters available
Input Voltage	24V DC
Output Type	Relay or transistor
Number of I/O Points	10, 20, 30, 40
Communication Ports	RS-232C (optional)
Operating Temperature	0°C to 55°C
Storage Temperature	-20°C
Humidity	10% to 90% (non-condensing)
Dimensions	Varies depending on the model
Weight	Varies depending on the model
Program Memory	2048 steps (2K steps)