Chapter 5: CPU Operation and Memory 31
10. GPC
Graphic Programming Console. Cutler-Hammer offers two program loader software packages
for programming, monitoring, and configuring the D50 PLC. The DOS-based package is
GPC5, the Windows
-based package is WinGPC. In this manual, GPC is used to refer to
either of these programs.
Overview of CPU Operation Mode
What Is the CPU Operation Mode?
The CPU has an external RUN/STOP switch. The PLC performs a system check that determines the
position of the switch. The switch position determines which operating mode the PLC is in. It can be in
Run, Stop, or Error mode.
Run Mode (operating)
The D50 PLC reads the external input signals and executes the user program stored in RAM. The
external outputs are updated every scan according to program results. When the switch is in Run
Mode, the user can also use the GPC program loader software to switch between the RUN and STOP
states.
Stop Mode
The user program is stopped and the external outputs are turned Off. In the Stop mode, you can
correct, delete, and transfer the program.
Error Mode
The Error mode occurs when the D50 PLC finds an error after running the self-diagnostics. When an
error occurs, the CPU stops program operation and turns off all external outputs. When the Error mode
occurs, do one of the following:
• Check the error code and take appropriate measures, then change power from Off to On.
• Switch the mode switch back to the STOP position. When the switch is returned to RUN the
program and data are re-initialized (excluding the retentive data).
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