Omron CPM2C

48
Unit Components Section 2-2
CPU Unit Component Descriptions
1,2,3... 1. Power Supply Connector
Connect the power supply (24 VDC) to this connector.
2. Input Terminals/Connector
Connects the CPU Unit to external input devices.
3. Output Terminals/Connector
Connects the CPU Unit to external output devices.
4. PC Status Indicators
These indicators show the operating status of the PC, as shown in the fol-
lowing table.
Note CPU Units with lot numbers of 3180O or earlier (produced 31 August
2000 or earlier) also have a PRO (green) indicator that operates as
follows:
5. Input Indicators
The input indicators are lit when the corresponding input terminal is ON.
The status of an input indicator will reflect the status of the input even when
that input is being used for a high-speed counter.
Note a) When interrupt inputs are used in interrupt input mode, the indica-
tor may not light even when the interrupt condition is met if the in-
put is not ON long enough.
b) Input indicators will reflect the status of the corresponding inputs
even when the PC is stopped, but the corresponding input bits will
not be refreshed.
6. Output Indicators
The output indicators are lit when the corresponding output terminal is ON.
The indicators are lit during I/O refreshing. The status of an output indica-
tor will also reflect the status of the corresponding output when the output
is being used as a pulse output.
Indicator Status Meaning
PWR
(green)
ON Power is being supplied to the PC.
OFF Power isn’t being supplied to the PC.
RUN
(green)
ON The PC is operating in RUN or MONITOR mode.
OFF The PC is in PROGRAM mode or a fatal error has
occurred.
COMM
(yellow)
Flashing Data is being transferred via the communications port
(peripheral or RS-232C).
OFF Data isn’t being transferred via communications port.
ERR/ALARM
(red)
ON A fatal error has occurred. (PC operation stops.)
Flashing A non-fatal error has occurred. (PC operation contin-
ues.)
OFF Indicates normal operation.
Indicator Status Meaning
PRO
(green)
ON The CPU Unit is set for Programming Console con-
nection.
OFF The CPU Unit is not set for Programming Console
connection.