RELIANCE 45C340模拟PLC输入模块卡
时间报警寄存器寄存器3、5和7是时间报警寄存器，其格式分别与寄存器2、4和6相似。寄存器3、5和7的位7是掩码位。掩码位激活时（逻辑一（1）），禁止在确定日时报警时使用特定的日时报警寄存器（见表4-13）。当所有掩码位均为低（0）时，当寄存器2、4和6与寄存器3、5和7中的值匹配时，将发生报警。当寄存器7的掩码位设置为逻辑1（1）时，在确定一天中的时间报警时，寄存器6将被忽略，并且每天都会发生报警。当寄存器7和5的掩码位设置为逻辑1（1）时，寄存器6和4将在确定一天中的时间报警时被忽略，并且每小时将发生一次报警。当寄存器7、5和3的掩码位设置为逻辑一（1）时，寄存器6、4和2将在确定一天中的时间报警时被忽略，并且每分钟会发生一次报警（当寄存器1的秒从59步进到00时）。
Time of Day Alarm Registers Registers 3, 5, and 7 are the Time of Day Alarm registers and are formatted similar to Register 2, 4, and 6 respectively. Bit 7 of registers 3, 5, and 7 is a mask bit. The mask bits, when active (logic one (1)), disable the use of the particular Time of Day Alarm register in the determination of the Time of Day Alarm (see Table 4-13). When all the mask bits are low (0) an alarm will occur when Registers 2, 4, and 6 match the values found in Registers 3, 5, and 7. When Register 7’s mask bit is set to a logic one (1), Register 6 will be disregarded in the determination of the Time of Day alarm and an alarm will occur everyday. When Registers 7 and 5’s mask bit is set to a logic one (1), Register 6 and 4 will be disregarded in the determination of the Time of Day alarm and an alarm will occur every hour. When Registers 7, 5 and 3’s mask bit is set to a logic one (1), Register 6, 4, and 2 will be disregarded in the determination of the Time of Day alarm and an alarm will occur every minute (when register 1’s seconds step from 59 to 00).
