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Operation without a Battery Section 3-6
!Caution Be absolutely sure that the power is turned off before changing CQM1 DIP
switch settings.
3-5-5 Comparing Memory Cassette Contents
The contents of the Memory Cassette can be compared to the contents of the
CQM1 memory to check to see if they are the same. This comparison can be
performed for any type of Memory Cassette.
Use the following procedure.
1,2,3... 1. Check to see that the CQM1 is in PROGRAM mode. If it is in either RUN
or MONITOR mode, use the peripheral device to change to the PRO-
GRAM mode.
2. Turn ON AR 1402 from the peripheral device. The contents of the Memory
Cassette will be compared to the contents of CQM1 memory.
3. With the LSS/SSS, clear the forced-set status to turn OFF AR 1402, which
will not change even after the operation is complete. (If the Programming
Console is being used, AR 1402 will automatically turn OFF.)
4. Check the status of AR 1403 to see the results of the comparison. AR 1403
will be ON if the contents were not the same or if the comparison was not
possible because the CQM1 was not in PROGRAM mode. If AR 1403 is
OFF, the comparison was successful and the contents were the same.
AR 1403 cannot be controlled from the program or from a peripheral device. It
is controlled by the results of comparison only.
If a comparison is attempted with the CQM1 in any mode but PROGRAM
mode, a non-fatal error will occur (FAL 9D) and AR 1412 will turn ON.
Although AR 1403 will also turn ON, no comparison will have been performed.
AR 1403 will also turn ON if a comparison is attempted without a Memory
Cassette mounted in the CQM1.
3-6 Operation without a Battery
Operation is still possible when there is no internal battery, or the internal bat-
tery has expired, by writing the required data (user program, PC Setup, etc.)
to a Memory Cassette. In this case, turn ON pin 2 on the DIP switch on the
front of the CPU Unit so that data stored in the Memory Cassette is trans-
ferred to the CPU Unit automatically at startup.
Note If the internal battery expires, the data in the CPU Unit (user program, set-
tings, etc.) will be lost when the power is turned OFF.
Consider the following precautions when operating with no internal battery or
with an expired battery.
1. When the internal battery expires, data will be affected in the following way.
• HR area, Timer/Counter PVs, DM area, and AR area data will be unreli-
able when the power is turned OFF.
• SR area data will become unstable when the power is turned OFF. There-
fore, do not set the I/O Hold Bit (SR 25212) and the Forced Status Hold
Bit (SR 25211) to be maintained in the PC Setup (DM 6601).
2. The I/O Hold Bit (SR 25212), the Forced Status Hold Bit (SR25211), and
the Output OFF Bit (SR 25215) will be particularly unstable and may have
an adverse effect on operation. Turn OFF these bits at the start of the pro-
gram. The following instructions can be used to do this.
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