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Interrupts The CQM1 supports three types of interrupts:
• Input Interrupts
Input interrupts are used to process input signals from an external device
that are shorter than the program execution time. Input signals with a pulse
width as short as 0.1 ms can be used.
• Scheduled Interrupts
Scheduled interrupts can be performed using a high-speed interval timer.
• High-speed Counter Interrupts
Single-phase pulses up to 5 kHz and two-phase pulses up to 2.5 kHz can be
input. High-speed counter interrupts can be combined with pulse outputs for
applications such as motor control. The CQM1-CPU43-EV1 and
CQM1-CPU44-EV1 can accept single-phase pulses up to 50 kHz and two-
phase pulses up to 25 kHz. The high-speed counter (absolute encoder input
for the CPU44-EV1) has two points added.
Pulse Output Function Pulses up to 1 kHz can be output from Output Unit contacts. The
CQM1-CPU43-EV1 has two dedicated ports for outputting 50 kHz pulses.
Communications A peripheral port and RS-232C port are available and are used to communicate
with external devices using the following methods.
• Host Link
The CQM1 using the host link can communicate with a personal computer
and Programmable Terminal using host link commands.
• RS-232C
The CQM1 using the RS-232C can read data from a bar code reader or
measurement device and output data to a printer.
• 1-to-1 Link
A data link can be created with a data area in another CQM1 to monitor the
other PC’s status and synchronize processes controlled by the PCs.
Analog Setting Function The CQM1-CPU42-EV1 provides volume controls with four channels for adjust-
ing analog settings.
Convenient I/O Instructions A single instruction can be used to input or output data, simplifying the program.
• The TEN KEY INPUT instruction can be used to read 8-digit BCD data input
from a ten-key.
• The HEXADECIMAL KEY INPUT instruction can be used to read 8-digit hexa-
decimal key input data from I/O Units.
• The DIGITAL SWITCH instruction can be used to read 4 or 8-digit BCD data
from digital switches.
• The 7-SEGMENT DISPLAY OUTPUT instruction can be used to output 4 or
8-digit data to 7-segment displays.
Macros The MACRO instruction can be used to call and execute subroutines, designat-
ing the I/O word for the subroutine as an argument. Using an argument to specify
a subroutine I/O words allows subroutines to be used more easily in different
locations, simplifying the program.
Differentiation Monitoring Up to now, differentiation monitoring was available only in top-of-the-line PCs.
Differentiation monitoring indicates when a bit goes from OFF to ON or from ON
to OFF. It can be used to monitor the status of inputs or bits that turn on and off in
very short intervals.
CQM1 Features
Section 1-3
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