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Initial System Checks and Test Run Procedure
Section 8-1
8-1
Initial System Checks and Test Run Procedure
8-1-1
Initial System Checks
Check the following items after setting up and wiring the CPM2B, but before
performing a test run.
Clearing Memory
Always clear memory before beginning to program the CPM2B. Although
memory is cleared before the CPU Board is shipped, the contents of the DM,
HR, AR, and counter areas may change in transit.
When a CPU Board without a clock is being used and the contents of DM
have been cleared, battery error detection must be disabled in the PLC Setup
by setting the leftmost digit of DM 6655 to 1.
Operating Mode at Startup
See 1-3-3 Operating Mode at Startup to determine what mode the CPM2B
will enter when the power is turned on.
8-1-2
Flash Memory Precautions
Observe the following precautions to protect the flash memory and ensure
proper operation.
1,2,3...
1.
If changes are made in the read-only DM Area (DM 6144 through DM
6599) or PLC Setup (DM 6600 through DM 6655), the PLC’s operating
mode must be changed to write the new contents to flash memory. If back-
up battery is replaced before the changes are written to flash memory, the
changes will be lost.
The changes can be saved by switching the CPM2B to RUN or MONITOR
mode or turning the CPM2B OFF and then ON again.
2.
When contents of the program, read-only DM (DM 6144 through DM
6599), or PLC Setup (DM 6600 through DM 6655) have been changed,
startup processing will take up to 1,200 ms longer than usual. Be sure to
take this one-time startup delay into account if it may affect operations.
3.
If one of the following three operations is performed in MONITOR or RUN
mode, the CPM2B’s cycle time will be extended by up to 1,200 ms and in-
terrupts will be disabled while the program or PLC Setup is being overwrit-
ten.
• Program changes with the online edit operation
• Changes to the read-only DM Area (DM 6144 through DM 6599)
• Changes to the PLC Setup (DM 6600 through DM 6655)
A “SCAN TIME OVER” error won’t occur during these operations. Be sure
to take this delay in the CPM2B’s I/O response times into account when
performing online editing.
Item
Points to check
Power supply and I/
O connections
Is the wiring correct?
Are the terminals securely tightened?
Are there any shorts between crimp terminals or wires?
Refer to 3-5 Wiring and Connections for details.
Connecting cables
Are the cables all connected correctly and locked?
Refer to 3-5 Wiring and Connections for details.
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