Introduction; Indicators; Pc Configuration - Omron SYSMAC C20P Operation Manual

PC Configuration

2–1

Introduction

2–2

Indicators

CPU Indicators
2–3 PC Configuration
CPU
Expansion I/O Unit
Special I/O Units
10
This section provides information on hardware aspects of P-type PCs that
are relevant to programming and software operation. These include indica-
tors on the CPU and basic PC configuration. This information is covered in
detail in the Installation Guide .
CPU indicators provide visual information on the general operation of the
PC. Using the flags and other error indicators provided in the memory data
areas, although not a substitute for proper error programming, provides
ready confirmation of proper operation.
CPU indicators are located on the front right hand side of the PC adjacent to
the I/O expansion slot and are described in the following table.
Indicator
POWER Lights when power is supplied to the CPU.
RUN Lights when the CPU is operating normally.
ERR Lights when an error is discovered in system error diagnosis op-
erations. When this indicator lights, the RUN indicator will go off,
CPU operation will be stopped, and all outputs from the PC will
be turned OFF.
ALARM Lights when an error is discovered in system error diagnosis op-
erations. PC operation will continue.
The Units from which P-type PCs can be built are shown below.
Unit type
C20P
C28P
C40P
C60P
C4K
C20P
C28P
C40P
C60P
Analog Timer Unit
C4K Analog Input Unit
C1K Analog Input Unit
Analog Output Unit
I/O Link Unit
Each PC is connected in series starting with a CPU and, if required, continu-
ing on with Expansion I/O or Special I/O Units. All other Units are connected
in series following the CPU and can be in any order desired except for the
I/O Link Unit, which must always come last. Up to five Units, including the
CPU can be connected as long as the total number of words occupied does
not exceed ten. Refer to Section 3–3 IR Area for configuration examples.
Function
Name Words
occupied
2
2
4
4
2
2
2
4
4
2
2
2
2
2
Section 2–3
Inputs Outputs
provided provided
12 points 8 points
16 points 12 points
24 points 16 points
32 points 24 points
4 input points or 4 output points
12 points 8 points
16 points 12 points
24 points 16 points
32 points 24 points
4 timer inputs
4 analog inputs
1 analog input
1 analog output
16 input and 16 output bits