描述
在PLC内部，定时器是通过对某一脉冲累积个数来完成的。常用脉冲有三类，即1、10、100ms脉冲，当用户需要不同定时时间时，可通过设定脉冲的个数来完成，当定时器到达设定值时，输出触点动作。
Hard Drive SCSI Seagate Barracuda ST34371WC 9C6004-030
Hard Drive SCSI Quantum LPS 240S GM24S027 01-D Eprom
Hard Drive SCSI IBM DNES-309170 25L1910 F42003 E182115
Hard Drive SCSI IBM 79F4022 C72756 56F8854 WDS-380S DH
Hard Drive SCSI Seagate Cheetah ST136403LW 9L7005-001
Hard Drive SCSI IBM PN55F9902 55F9916 EC844857 012587
Hard Drive SCSI Rodime RO3259T E1 S36423862 12007730
Hard Drive SCSI Disk MiniScribe 8425S C493571 G03-88
Hard Drive SCSI Hewlett Packard DPSS-318350 07N5277 HP
Hard Drive SCSI Seagate Cheetah ST336706LC 9T9001-001
Hard Drive SCSI IBM Ultrastar IC35L009VWD210-0 07N6360
