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CPM2B Features and Functions
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
Analog Settings
DIP Switch Inputs
Synchronized pulse control provides an easy way to synchronize the opera-
tion of a peripheral piece of equipment with the main equipment. The output
pulse frequency can be controlled as some multiple of the input pulse fre-
quency, allowing the speed of a peripheral piece of equipment (such as a sup-
ply 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 CPM2B has a total of five high-speed counter inputs. The one high-speed
counter input has a response frequency of 20 kHz/5 kHz and the four interrupt
inputs in counter mode have a response frequency of 2 kHz.
The high-speed counter can be used in any one of the four input modes: dif-
ferential 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
triggered when the count matches a set value or falls within a specified range.
The interrupt inputs in counter mode can be used for incrementing counters or
decrementing counters (2 kHz) and trigger an interrupt (executing the inter-
rupt program) when the count matches the target value.
CPM2B PLCs 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
frequency 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.
There are four inputs used for interrupt inputs (shared with quick-response
inputs and interrupt inputs in counter mode) with a minimum input signal width
of 50 µ s and response time of 0.3 ms. When an interrupt input goes ON, the
main program is stopped and the interrupt program is executed.
There are four inputs used for quick-response inputs (shared with interrupt
inputs and interrupt inputs in counter mode) that can reliably read input sig-
nals with a signal width as short as 50 µ s.
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 input time con-
stant is fixed to 1 ms for 40-point and 64-point Input Expansion I/O Board.)
The interval timer can be set between 0.5 and 319,968 ms and can be set to
generate just one interrupt (one-shot mode) or periodic interrupts (scheduled
interrupt mode).
There are two controls on the CPU Board that can be turned to change the
analog settings (0 to 200 BCD) in IR 250 and IR 251. These controls can be
used to easily change or fine-tune machine settings such as a conveyor belt's
pause time or feed rate.
A DIP switch is provided that controls the status of four input bits.
CPM2B
Section 1-1
Motor driver Motor
3
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