Mitsubishi A1SH, Руководство пользователя, Страница: 55 / 186

4. AnSHCPU MODULE
4 - 15
MELSEC-A
4.2 Functions
The following table describes the functions of the AnSHCPU.
Table 4.6 List of functions
Function Description
Section
reference
Constant scan
•
Executes the sequence program at the predetermined intervals independently of the scan
time.
•
Setting allowed from 10 to 2000 msec.
4.2.1
Latch (power
interruption
compensation)
•
Retains device data while the PLC is switched OFF or reset or a momentary power
interruption of 20 msec or longer occurs.
•
L, B, T, C, D and W can be latched.
4.2.2
Remote RUN/STOP
•
Allows remote RUN/STOP control from an external device (e.g. peripheral, external input,
computer) with the RUN/STOP switch in the RUN position.
4.2.3
PAUSE
•
Stops operation with the output (Y) status retained.
•
Pause function may be switched ON by using either of the following :
Remote PAUSE contact
Peripheral device
4.2.4
Status latch
•
Stores all device data in the status latch area in the AnS when the status latch condition is
switched ON.
•
The stored data can be monitored by a peripheral device.
4.2.5
Sampling trace
•
Samples the specified device operating status at predetermined intervals and stores the
sampling result in the sampling trace area in the AnS.
•
The stored data can be monitored by a peripheral device.
4.2.6
Offline switch
•
Allows the device (Y, M, L, S, F, B) used with the OUT instruction to be disconnected from
the sequence program processing.
4.2.7
Priority setting
ERROR LED
•
Sets the ON/OFF status of the ERROR LED in the event of an error. 4.2.8
Clock *1
•
Executes clock operation in the CPU module.
•
Clock data includes the year, month, day, hour, minute, second, and day of the week.
•
Clock data can be read from special registers D9025 to D9028.
4.2.9
*1 The year only contains the last two digits of the year. Therefore, when the clock data is read from
the PLC CPU and used in the sequence control, the year data may have to be fixed using a
sequence program depending on the usage.
Year 1999
→
"99"
Year 2000
→
"00"
When comparison is made only with the last two digits of the year read, the year 2000 and
consecutive years are considered older than the year 1999.
REMARK
The AnSHCPU cannot do "step operation", "PAUSE using RUN/STOP key switch", or "I/O module
replacement at online".