斷(duan)開延時(shi)(shi)型定時(shi)(shi)器(qi)：當輸(shu)入條件00000為ON時(shi)(shi)無延時(shi)(shi)作用(yong)，只有在(zai)輸(shu)入條件00000為OFF時(shi)(shi)產生延時(shi)(shi)作用(yong)。它在(zai)SIEMENS的PLC中又被稱(cheng)為SF型定時(shi)(shi)器(qi)。

接(jie)通延時型(xing)定(ding)(ding)時器：是各種PLC中常見的基本的定(ding)(ding)時器，這種定(ding)(ding)時器在(zai)SIEMENS的PLC中，稱為SD型(xing)定(ding)(ding)時器。

保持型接通延時定(ding)(ding)(ding)時器(qi)：又稱SS型定(ding)(ding)(ding)時器(qi)，是當(dang)輸(shu)入條件(jian)(jian)00000為(wei)ON后，即產生鎖存(cun)功能，即使(shi)輸(shu)入條件(jian)(jian)00000又變為(wei)OFF，仍視輸(shu)入條件(jian)(jian)為(wei)ON，當(dang)定(ding)(ding)(ding)時器(qi)的當(dang)前值等于設定(ding)(ding)(ding)值時，定(ding)(ding)(ding)時器(qi)動(dong)作。

脈沖型(xing)定(ding)(ding)(ding)(ding)(ding)時(shi)(shi)(shi)器(qi)(qi)(qi)：當輸入(ru)條(tiao)件(jian)00000為(wei)ON后，定(ding)(ding)(ding)(ding)(ding)時(shi)(shi)(shi)器(qi)(qi)(qi)即(ji)時(shi)(shi)(shi)動作，但(dan)經過定(ding)(ding)(ding)(ding)(ding)時(shi)(shi)(shi)器(qi)(qi)(qi)所設定(ding)(ding)(ding)(ding)(ding)的(de)(de)時(shi)(shi)(shi)間(jian)后，即(ji)使輸入(ru)條(tiao)件(jian)00000仍(reng)為(wei)ON，定(ding)(ding)(ding)(ding)(ding)時(shi)(shi)(shi)器(qi)(qi)(qi)卻變為(wei)OFF狀態。即(ji)這(zhe)種(zhong)定(ding)(ding)(ding)(ding)(ding)時(shi)(shi)(shi)器(qi)(qi)(qi)ON狀態的(de)(de)維(wei)持(chi)時(shi)(shi)(shi)間(jian)是由設定(ding)(ding)(ding)(ding)(ding)值(zhi)決定(ding)(ding)(ding)(ding)(ding)的(de)(de)。如果(guo)00000為(wei)ON的(de)(de)時(shi)(shi)(shi)續時(shi)(shi)(shi)間(jian)小于定(ding)(ding)(ding)(ding)(ding)時(shi)(shi)(shi)器(qi)(qi)(qi)的(de)(de)設定(ding)(ding)(ding)(ding)(ding)值(zhi)，定(ding)(ding)(ding)(ding)(ding)時(shi)(shi)(shi)器(qi)(qi)(qi)的(de)(de)ON狀態維(wei)持(chi)時(shi)(shi)(shi)間(jian)為(wei)輸入(ru)條(tiao)件(jian)00000為(wei)ON的(de)(de)持(chi)續時(shi)(shi)(shi)間(jian)。這(zhe)種(zhong)定(ding)(ding)(ding)(ding)(ding)時(shi)(shi)(shi)器(qi)(qi)(qi)在(zai)SIEMENS的(de)(de)PLC中(zhong)，稱為(wei)SP型(xing)定(ding)(ding)(ding)(ding)(ding)時(shi)(shi)(shi)器(qi)(qi)(qi)。

擴張型(xing)脈沖定(ding)(ding)時(shi)(shi)器(qi)：這(zhe)種定(ding)(ding)時(shi)(shi)器(qi)與(yu)脈沖型(xing)定(ding)(ding)時(shi)(shi)器(qi)的區(qu)別(bie)是，只要輸入條件00000出現(xian)了ON狀(zhuang)態，不管(guan)其持續時(shi)(shi)間多長，均可使定(ding)(ding)時(shi)(shi)器(qi)為ON的維持的時(shi)(shi)間與(yu)定(ding)(ding)時(shi)(shi)器(qi)的設(she)定(ding)(ding)值一(yi)致。這(zhe)種定(ding)(ding)時(shi)(shi)器(qi)在SIEMENS的PLC中，稱(cheng)為SE型(xing)定(ding)(ding)時(shi)(shi)器(qi)。