Conformance To Ec Directives - Omron CPM1 Programming Manual

Conformance to EC Directives

!Caution Be sure that the SRM1 system is not influenced by any undefined data if the
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Conformance to EC Directives

1,2,3...
changes (i.e., the contents of the RAM) will be erased and the data values
will become undefined.
data in the DM, HR, or CNT area is cleared when the SRM1 has been turned
OFF for a period exceeding the data backup period of the internal lithium bat-
tery. If the AR 1414 flag is ON, the data will be held unless it is turned OFF
using the I/O Monitor operation, instructions, etc. The system can be stopped
by designating DM 6604 in the PC Setup so that a memory error occurs when
the power interruption hold area is not held (with AR 1314 ON)
• A lithium battery in the CPU Unit is used to back up the counter values
and the contents of the DM area, and HR area. The deterioration of the
lithium battery capacity depends on the ambient temperature. The stan-
dard service life is 12 years at an ambient temperature of 40 C when
operating 8 hours a day.
If the power remains off for a period exceeding the data backup period, the
contents of the Data Memory (DM), Hold Relay (HR), and Counter (CNT)
Areas in the CPU Unit may be cleared and the AR 1314 flag (which turns ON
when the power interruption hold area is not held) may turn ON.
If the contents of the CPU Unit's program area are lost, the program stored in
flash memory will be read to the CPU Unit's program area when the SRM1 is
started up because the contents in the read-only area (DM 6144 through
DM 6599) and PC Setup (DM 6600 through DM 6655) will be written to flash
memory.
• However, if the power is turned OFF without changing the mode even if
changes are made in the read-only DM area (DM 6144 through DM
6599), or PC Setup (DM 6600 through DM 6655) using a peripheral
device, the contents of changes will not be written to flash memory.
Although the data in these areas is backed up by the lithium battery, con-
tents of changes will disappear if the service life of the lithium battery
expires. In this case, programs in the flash memory will be automatically
read into the user program memory.
The changes can be saved by switching the SRM1 to RUN or MONITOR
mode or turning OFF and restarting the SRM1 soon after the changes are
made.
The CQM1 PCs comply with EC Directives. To ensure that the machine or
device in which a CQM1 PC is used complies with EC Directives, the PC must
be installed as follows:
1. The PC must be installed within a control panel.
2. Reinforced insulation or double insulation must be used for the DC power
supplies used for the communications and I/O power supplies.
3. PCs complying with EC Directives also conform to the Common Emission
Standard (EN50081-2). When a PC is built into a machine, however, noise
can be generated by switching devices using relay outputs and cause the
overall machine to fail to meet the Standard. If this occurs, surge killers
must be connected or other measures taken external to the PC.
The following methods represent typical methods for reducing noise, and
may not be sufficient in all cases. Required countermeasures will vary de-
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