12
CJ1-H and CJ1M CPU Unit Features Section 1-3
Binary Refreshing of
Timer/Counter Instruction
PVs
Present values of timer/counter instructions can now be refreshed in binary, in
addition to the existing BCD capability. (Binary refreshing, however, can be
specified with only CX-Programmer Ver. 3.0 and higher.) This allows the timer/
counter setting time to be expanded to a range of 0 to 65535 (from the exist-
ing 0 to 9,999). Also, results calculated by other instructions can be used as is
for timer/counter set values.
Windows-based Support
Software
The single-port multiple-access (SPMA) function can be used to program and
monitor other CPU Bus Units on the same bus (CPU Rack or Expansion
Racks) or other CPU Units on the same network from a serial port on the CPU
Unit.
1-3 CJ1-H and CJ1M CPU Unit Features
1-3-1 CJ1-H CPU Unit Features
Ultra High-speed Cycle
Time
The CJ1-H CPU Units provide a cycle time that is three to four times faster
than that of the CJ1 CPU Units.
For example, a program consisting of 38 Ksteps of only basic instructions with
128 inputs and 128 outputs executes in 1 ms (4.9 ms for the CJ1 CPU Units);
a program consisting of 20 Ksteps of basic and special instructions in a 1:1
ratio with 128 inputs and 128 outputs executes in 1 ms (2.7 ms for the CJ1
CPU Units); and a program consisting of 8 Ksteps of basic and special
instructions in a 1:2 ratio with 64 inputs and 64 outputs executes in 0.5 ms
(1.4 ms for the CJ1 CPU Units).
The following factors give the CJ1-H CPU Units their high speed.
1,2,3... 1. Instruction execution times: Only about 1/2 the time required for basic in-
structions, and only about 1/3 the time required for special instructions.
2. Better bus performance: Data transfers between the CPU Unit and Special
I/O or Communications Units is about twice as fast, providing greater over-
all system performance.
3. Instruction execution is performed in parallel with peripheral servicing.
4. Other factors, including background execution of text string processing and
table data processing instructions.
Controller Link
Programming Device
Several CPU Bus Units on the same
bus or other CPU Units on the same
network can be accessed from a
single port.
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