Omron SYSMAC CQM1H Series, Руководство по программированию

Страница: 500 / 602

475
Power Interruptions Section 7-2
Note 1. Servicing Inner Boards with control functions involves transferring data be-
tween the CPU Unit and High-speed Counter, Pulse I/O, Absolute Encoder
Interface, Analog Setting, and Analog I/O Boards.
2. Servicing Inner Boards with communications functions involves transfer-
ring data between the CPU Unit and the Serial Communications Boards.
I/O Refresh Methods CQM1H I/O refresh operations are broadly divided into two categories. The
first of these, input refresh, involves reading the ON/OFF status of input points
to the input bits. The second, output refresh, involves writing the ON/OFF sta-
tus after program execution to the output points. The CQM1H I/O refresh
methods are as shown in the following table.
The default settings for I/O refreshing are as follows:
Inputs: Only cyclic refresh executed.
Outputs: Only cyclic refresh executed.
Cyclic refreshing must be executed for both inputs and outputs. Input refresh-
ing at interrupts can be enabled by setting the input refresh range in the PC
Setup (DM 6630 to DM 6638). Direct refreshing can be enabled using the set-
ting in DM 6639 of the PC Setup.
In addition to the methods described above, it is also possible to execute I/O
refreshes from the ladder program by means of IORF(97).
7-2 Power Interruptions
7-2-1 Operation at Power Interruption
The following processing is performed if CPU Unit power is interrupted. The
following processing will be performed if the power supply falls below 85% of
the rated voltage while the CPU Unit is in RUN or MONITOR mode.
1,2,3... 1. The CPU Unit will stop.
2. Outputs from all Output Units will be turned OFF.
Note All outputs will turn OFF regardless of the status of the I/O Hold Bit or the set-
ting of the I/O Hold Bit Status setting in the PC Setup.
85% of the Rated Voltage:
AC power: 85 V for a 100-V AC system and 170 V for a 200-V AC system
DC power: 19.2 V DC
The following processing will be performed for a momentary power interrup-
tion.
1,2,3... 1. The system will continue to run unconditionally if the power interruption
(i.e., the period during which the voltage is less than 85% of the rated volt-
age) lasts less than 10 ms for AC power supply, or 5 ms for DC power sup-
ply.
Input/Output I/O refresh method Function
Input Cyclic refresh Input refresh is executed at a set time once per cycle.
Interrupt input refresh Input refresh is executed before execution of the interrupt routine whenever
an input interrupt, interval timer interrupt, or high-speed counter interrupt
occurs. (The cyclic refresh is also executed.)
Output Cyclic refresh Output refresh is executed at a set time once per cycle.
Direct refresh When there is an output from the user’s program, that output point is imme-
diately refreshed. (The cyclic refresh is also executed.)