Cpm2C-S Structure And Operation; Cpm2C-S Structure - Omron CPM2C-S100C Operation Manual

CPM2C-S Structure and Operation

1-3

CPM2C-S Structure and Operation

1-3-1

CPM2C-S Structure

DeviceNet
Master
External
input
devices
I/O Memory
Program
PC Setup
Communications
Switches
The following diagram shows the internal structure of the CPU Unit.
I/O memory
Program
Settings
Commu-
nications
port
Settings
Communications
switches
The program reads and writes data in this memory area during execution.
Part of the I/O memory contains the bits that reflect the status of the PC's
inputs and outputs. Parts of the I/O memory are cleared when the power is
turned ON and other parts are retained.
Note Refer to SECTION 4 Memory Areas for more details on I/O memory.
This is the program written by the user. The CPM2C-S executes the program
cyclically. (Refer to 1-3-5 Cyclic Operation and Interrupts for details.)
The program can be divided broadly into two parts: the "main program" that is
executed cyclically and the "interrupt programs" that are executed only when
the corresponding interrupt is generated.
The PC Setup contains various startup and operating parameters. The PC
Setup parameters can be changed from a Programming Device only; they
cannot be changed from the program.
Some parameters are accessed only when PC's power supply is turned ON
and others are accessed regularly while the power is ON. It will be necessary
to turn the power OFF and then ON again to enable a new setting if the
parameter is accessed only when the power is turned ON.
Note Refer to 4-6 PC Setup for details on the PC Setup.
The Communications Switches determine whether the peripheral port and
RS-232C port connected through the communications port operate with the
PC Setup
Settings
Section 1-3
CompoBus/S
Slaves
External
output
devices
17