斷開延時(shi)型定時(shi)器(qi)(qi)：當輸入條(tiao)件00000為ON時(shi)無(wu)延時(shi)作用，只有在輸入條(tiao)件00000為OFF時(shi)產生延時(shi)作用。它在SIEMENS的PLC中又被稱為SF型定時(shi)器(qi)(qi)。

接通延時(shi)型定時(shi)器：是各(ge)種(zhong)(zhong)PLC中常見的(de)基本的(de)定時(shi)器，這種(zhong)(zhong)定時(shi)器在SIEMENS的(de)PLC中，稱為SD型定時(shi)器。

保持型接通延時(shi)定(ding)(ding)時(shi)器(qi)(qi)：又(you)稱SS型定(ding)(ding)時(shi)器(qi)(qi)，是當輸入(ru)條件(jian)00000為ON后，即產生鎖存功能，即使輸入(ru)條件(jian)00000又(you)變為OFF，仍視輸入(ru)條件(jian)為ON，當定(ding)(ding)時(shi)器(qi)(qi)的當前值等于設(she)定(ding)(ding)值時(shi)，定(ding)(ding)時(shi)器(qi)(qi)動作。

脈沖型定(ding)時(shi)(shi)(shi)器(qi)(qi)：當輸(shu)入(ru)條件00000為ON后(hou)，定(ding)時(shi)(shi)(shi)器(qi)(qi)即(ji)時(shi)(shi)(shi)動(dong)作，但經過定(ding)時(shi)(shi)(shi)器(qi)(qi)所設定(ding)的時(shi)(shi)(shi)間(jian)(jian)后(hou)，即(ji)使輸(shu)入(ru)條件00000仍為ON，定(ding)時(shi)(shi)(shi)器(qi)(qi)卻變為OFF狀態(tai)。即(ji)這(zhe)種定(ding)時(shi)(shi)(shi)器(qi)(qi)ON狀態(tai)的維(wei)持時(shi)(shi)(shi)間(jian)(jian)是由設定(ding)值決定(ding)的。如果00000為ON的時(shi)(shi)(shi)續時(shi)(shi)(shi)間(jian)(jian)小于定(ding)時(shi)(shi)(shi)器(qi)(qi)的設定(ding)值，定(ding)時(shi)(shi)(shi)器(qi)(qi)的ON狀態(tai)維(wei)持時(shi)(shi)(shi)間(jian)(jian)為輸(shu)入(ru)條件00000為ON的持續時(shi)(shi)(shi)間(jian)(jian)。這(zhe)種定(ding)時(shi)(shi)(shi)器(qi)(qi)在SIEMENS的PLC中，稱(cheng)為SP型定(ding)時(shi)(shi)(shi)器(qi)(qi)。

擴張型(xing)脈沖(chong)(chong)定(ding)(ding)時(shi)(shi)器(qi)：這(zhe)種(zhong)定(ding)(ding)時(shi)(shi)器(qi)與(yu)脈沖(chong)(chong)型(xing)定(ding)(ding)時(shi)(shi)器(qi)的(de)區別(bie)是(shi)，只要(yao)輸入條件00000出現了ON狀態(tai)，不管其持續時(shi)(shi)間(jian)多長，均可使定(ding)(ding)時(shi)(shi)器(qi)為ON的(de)維(wei)持的(de)時(shi)(shi)間(jian)與(yu)定(ding)(ding)時(shi)(shi)器(qi)的(de)設定(ding)(ding)值一致。這(zhe)種(zhong)定(ding)(ding)時(shi)(shi)器(qi)在SIEMENS的(de)PLC中，稱(cheng)為SE型(xing)定(ding)(ding)時(shi)(shi)器(qi)。