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2-1 Introduction
This section provides information on hardware aspects of K-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
.
2-2 Indicators
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 con-
firmation 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 Function
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
operations. 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
operations. PC operation will continue.
2-3 PC Configuration
The system must contain a K-type CPU and may additionally contain an Ex-
pansion I/O Unit, Special I/O Units and/or I/O Link Units.
The Expansion I/O Units are not a required part of the basic system and are
used to increase the number of I/O points available. Special I/O Units and I/O
Link Units are used to reduce programming complexity.
CPU Indicators
PC Configuration Section 2-3