Omron CPM2C Operation Manual page 19

Built-in Motor Control Capability
Synchronized Pulse
Control
(Transistor Outputs Only)
High-speed Counters and
Interrupts
Easy Position Control
with Pulse Outputs
(Transistor Outputs Only)
High-speed Input Capabilities for Machine Control
High-speed Interrupt
Input Function
Quick-response Input
Function
Stabilizing Input Filter
Function
Other Functions
Interval Timer Interrupts
Synchronized pulse control provides an easy way to synchronize the operation
of a peripheral piece of equipment with the main equipment. The output pulse
frequency can be controlled as some multiple of the input pulse frequency, al-
lowing the speed of a peripheral piece of equipment (such as a supply conveyor)
to be synchronized with the speed of the main piece of equipment.
Encoder
Pulses are output as a fixed multiple of the input frequency.
The CPM2C has a two kinds of high-speed counter inputs. The high-speed
counter input has a response frequency of 20 kHz/5 kHz and the interrupt inputs
(in counter mode) have a response frequency of 2 kHz.
The single high-speed counter can be used in any one of the four input modes:
differential phase mode (5 kHz), pulse plus direction input mode (20 kHz), up/
down pulse mode (20 kHz), or increment mode (20 kHz). Interrupts can be trig-
gered when the count matches a set value or falls within a specified range.
The interrupt inputs (counter mode) can be used for incrementing counters or
decrementing counters (2 kHz) and trigger an interrupt (executing the interrupt
program) when the count matches the target value. Four interrupt inputs can be
used in the 20-point CPU Units and two interrupt inputs can be used in the
10-point CPU Units.
CPM2C PCs with transistor outputs have two outputs that can produce 10 Hz to
10 kHz pulses (single-phase outputs).
When used as single-phase pulse outputs, there can be two outputs with a fre-
quency range of 10 Hz to 10 kHz with a fixed duty ratio or 0.1 to 999.9 Hz with a
variable duty ratio (0 to 100% duty ratio).
When used as pulse plus direction or up/down pulse outputs, there can be just
one output with a frequency range of 10 Hz to 10 kHz.
The 20-point CPU Units have 4 inputs that can be used as interrupt inputs and
the 10-point CPU Units have 2 inputs that can be used as interrupt inputs. These
inputs are shared with quick-response inputs and interrupt inputs in counter
mode and have a minimum input signal width of 50 µs and response time of
0.3 ms. When an interrupt input goes ON, the main program is stopped and the
interrupt program is executed.
Regardless of the cycle time, the 20-point CPU Units have 4 inputs that can be
used as quick-response inputs and the 10-point CPU Units have 2 inputs that
can be used as quick-response inputs. These inputs are shared with interrupt
inputs and interrupt inputs in counter mode; they can reliably read input signals
with a signal width as short as 50 µs.
The input time constant for all inputs can be set to 1 ms, 2 ms, 3 ms, 5 ms,
10 ms, 20 ms, 40 ms, or 80 ms. The effects of chattering and external noise can
be reduced by increasing the input time constant.
The interval timer can be set between 0.5 and 319,968 ms and can be set to gen-
erate just one interrupt (one-shot mode) or periodic interrupts (scheduled inter-
rupt mode).
CPM2C
Motor driver Motor
Section 1-1