Comparison of the CX-Simulator and SYSMAC CS/CJ–series PLCs Section 1-7
18
1-7 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 (programs)
vs. CX-Simulator:
Multiple 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, 32 I/O interrupt tasks, 2 scheduled inter-
rupt tasks, 1 power OFF interrupt task, and 256
external interrupt tasks.
In the CX-Simulator, the program
is divided into two areas: the pro-
gram 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, subrou-
tine numbers, and block program
numbers can not overlap between
program areas.
I/O allocation "Create I/O table"
CS/CJ-series
PLC: Required
vs. CX-Simulator:
Own settings
required
In CS/CJ-series PLCs, word allocation does not
depend only on slot position, and it is not nec-
essary to allocate words to an empty slot. If a
Unit requires several words, those words can
be allocated.
When a CS/CJ-series PLC is being used, the
I/O Table Registration operation must be exe-
cuted. 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 edit-
ing
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
performed for the cycle time of one cycle to
multiple cycles (where the cycle time is ex-
tended 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
peripheral 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 pro-
gram from the top when online
editing during Step Run] will
cause the following operation.
Not checked: Enter the Program
mode.
Checked: Scan Replay
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