Omron SYSMAC CPM2B-S001M-DRT Operation Manual page 73

Introduction
DM Area
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word data, it will access the present value (PV); if it is used for bit data, it will
access the Completion Flag for the timer/counter.
DM area data is accessed in word units only. The contents of the DM area are
retained even after the PC power supply has been turned off or when opera-
tion begins or stops.
DM words DM 0000 through DM 1999 and DM 2022 through 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 Section
9 Troubleshooting for details on the error log.
Note DM 6600 through DM 6655 contain the PC Setup. Refer to 4-6 PC Setup for
details.
Section 4-1
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