Srm1 Flash Memory - Omron CPM1 Programming Manual

SRM1 Flash Memory

3-3-9 DM Area
Error Log
PC Setup
3-4 SRM1 Flash Memory
Writing Data
Changing Memory Areas
Cycle Times
148
DM area data is accessed in word units only. The contents of the DM area are
retained even after the SRM1 power supply has been turned off or when oper-
ation begins or stops.
DM words DM 0000 through DM 1999, DM 2022, and DM 2047 can be used
freely in the program; other DM words are allocated specific functions,
described below.
DM 2000 through DM 2021 contain the error log information. Refer to SEC-
TION 8 Troubleshooting for details on the error log.
DM 6600 through DM 6655 contain the PC Setup. Refer to SECTION 1 PC
Setup and Other Features for details.
The following settings must be made to use the flash memory area for SRM1
PCs.
In order to write the contents of the UM area, the DM read-only area (DM
6144 to DM 6599, and the PC Setup area (DM 6600 to DM 6655) to the flash
memory, either one of the following operations must be performed.
• Switch the SRM1 to either the MONITOR or PROGRAM mode.
• Turn the power to the SRM1 off and on again.
Note If changes are made to the above memory areas, they are not written to the
flash memory, and the power is switched off for 20 days or more (at 25 C), the
changes (in RAM) will be lost. If this occurs, the unchanged contents will be
read from the flash memory when the PC is started again.
When operating the SRM1 for the first time after changes have been made to
the UM area, the DM read only area (DM 6144 to DM 6599, and the PC Setup
area (DM 6600 to DM 6655), beware of the effect resulting from the SRM1's
delay in the operation on other devices.
The first operation for the SRM1 after the above memory areas have been
changed will be a maximum of 850 ms later than the normal first operation
without changes.
A cycle time overflow warning will not be issued when any of the following
operations are performed in either MONITOR or OPERATION modes. Be
careful of the effect of using online editing on SRM1 I/O response time.
• Changes to the program using online editing.
• Changes to the read-only DM area (DM 6144 to DM 6599.)
• Changes to the PC Setup area (DM 6600 to DM 6655.)
When any of the above operations are performed, the SRM1 cycle time will be
increased by a maximum of 850 ms. During this tiny interrupts will be disabled
while the program or memory contents is written.
Section 3-4