Comparison of the CX-Simulator and SYSMAC CS/CJ-series PLCs Section 1-6
18
1-6 Comparison of CX-Simulator and SYSMAC CS/CJ-series PLCs
In the CX-Simulator, the part implementing PLC functions (CS/CJ CPU Unit
and Communications Unit) is called the Ladder Engine. The following list
compares SYSMAC CS/CJ-series PLC with and the Ladder Engine of the
CX-Simulator. Take notice of the followings when using the CX-Simulator.
Item CS/CJ-series PLC CX-Simulator
Program
structure
CS/CJ-series PLC:
Multiple tasks (pro-
grams) vs.
CX-Simulator: Mul-
tiple program areas/
multiple tasks
In CS/CJ-series PLCs, the program is divided into
tasks (cyclic tasks) that are executed in order when
they are enabled.
CS/CJ-series PLCs support up to 32 cyclic tasks (128
cyclic tasks for CJ2-series PLCs), 32 I/O interrupt
tasks, 2 scheduled interrupt tasks, 1 power OFF in-
terrupt task, and 256 external interrupt tasks.
In the CX-Simulator, the program is
divided into two areas: the program
area for applications (UM1) and for
debugging (UM2). One program area
corresponds to a CS/CJ's UM and
accesses the same I/O memory area.
Usually only UM1 is used.
However, task numbers, subroutine
numbers, and block program numbers
can not overlap between program
areas.
The following functions that are sup-
ported by CS/CJ-series Ver.2.0 and
CP-series CPU Units cannot be used.
• Task download
• Task protection (functions as UM
read protection)
I/O allocation "Create I/O table"
CS-series PLC:
Required vs.
CX-Simulator: Own
settings required
In CS/CJ-series PLCs, word allocation does not de-
pend only on slot position, and it is not necessary to
allocate words to an empty slot. If a Unit requires
several words, those words can be allocated.
When a CS-series PLC is being used, the I/O Table
Registration operation must be executed. If it is not
executed, the CPU Unit will not recognize each Basic
I/O Unit, Special I/O Unit, and CPU Bus Unit that has
been installed.
The I/O table is not used.
In the PLC Setup wizard or PLC Unit
Setting, the unit for own use is selected.
Although the machine number and the
unit number are set, the slot is not set.
The I/O refresh time is calculated
based on the selected units.
Online editing CS/CJ-series PLC:
RUN /MONITOR
mode vs.
CX-Simulator:
Continuous run
(Run/Monitor mode),
Pause (Scan Run,
Step Run, Break
point, and I/O break
condition)
In CS/CJ-series PLCs, peripheral servicing is per-
formed for the cycle time of one cycle to multiple cycles
(where the cycle time is extended up to 90 ms per one
cycle).
In the CX-Simulator, the process is
completed within one cycle. There is
no limit for the maximum extension time
per one cycle.
When in Continuous Run, the periph-
eral servicing performs the process.
When the ladder program is in pausing,
the peripheral servicing is always
working, enabling online editing.
However, if online editing is performed
during the program execution, The
setting of [System Status Setting] |
[Settings] | [PLC Operation Setting] |
[Run the program from the top when
online editing during Step Run] will
cause the following operation.
Not checked: Enter the Program mode.
Checked: Scan Replay
To Next Page
Loading...
Need help?
General