斷(duan)開延(yan)時型定時器：當輸(shu)入條(tiao)件(jian)00000為ON時無延(yan)時作(zuo)用(yong)，只有在輸(shu)入條(tiao)件(jian)00000為OFF時產生延(yan)時作(zuo)用(yong)。它(ta)在SIEMENS的PLC中又被稱為SF型定時器。

接通延時型(xing)定(ding)時器：是各種PLC中(zhong)常見的(de)基本的(de)定(ding)時器，這種定(ding)時器在SIEMENS的(de)PLC中(zhong)，稱為SD型(xing)定(ding)時器。

保(bao)持型接通延時(shi)(shi)定(ding)(ding)時(shi)(shi)器(qi)(qi)：又稱SS型定(ding)(ding)時(shi)(shi)器(qi)(qi)，是當(dang)(dang)輸入(ru)條(tiao)(tiao)件(jian)00000為ON后，即產生鎖存功能，即使輸入(ru)條(tiao)(tiao)件(jian)00000又變為OFF，仍視(shi)輸入(ru)條(tiao)(tiao)件(jian)為ON，當(dang)(dang)定(ding)(ding)時(shi)(shi)器(qi)(qi)的當(dang)(dang)前值等于設定(ding)(ding)值時(shi)(shi)，定(ding)(ding)時(shi)(shi)器(qi)(qi)動作。

脈沖型(xing)定(ding)時(shi)(shi)(shi)器(qi)(qi)(qi)(qi)(qi)：當輸(shu)入條(tiao)(tiao)件(jian)(jian)00000為(wei)ON后，定(ding)時(shi)(shi)(shi)器(qi)(qi)(qi)(qi)(qi)即(ji)時(shi)(shi)(shi)動作(zuo)，但經過定(ding)時(shi)(shi)(shi)器(qi)(qi)(qi)(qi)(qi)所設(she)(she)(she)定(ding)的(de)時(shi)(shi)(shi)間(jian)(jian)后，即(ji)使(shi)輸(shu)入條(tiao)(tiao)件(jian)(jian)00000仍為(wei)ON，定(ding)時(shi)(shi)(shi)器(qi)(qi)(qi)(qi)(qi)卻(que)變(bian)為(wei)OFF狀(zhuang)態(tai)(tai)。即(ji)這種(zhong)定(ding)時(shi)(shi)(shi)器(qi)(qi)(qi)(qi)(qi)ON狀(zhuang)態(tai)(tai)的(de)維(wei)持(chi)時(shi)(shi)(shi)間(jian)(jian)是由設(she)(she)(she)定(ding)值決定(ding)的(de)。如果00000為(wei)ON的(de)時(shi)(shi)(shi)續(xu)時(shi)(shi)(shi)間(jian)(jian)小于定(ding)時(shi)(shi)(shi)器(qi)(qi)(qi)(qi)(qi)的(de)設(she)(she)(she)定(ding)值，定(ding)時(shi)(shi)(shi)器(qi)(qi)(qi)(qi)(qi)的(de)ON狀(zhuang)態(tai)(tai)維(wei)持(chi)時(shi)(shi)(shi)間(jian)(jian)為(wei)輸(shu)入條(tiao)(tiao)件(jian)(jian)00000為(wei)ON的(de)持(chi)續(xu)時(shi)(shi)(shi)間(jian)(jian)。這種(zhong)定(ding)時(shi)(shi)(shi)器(qi)(qi)(qi)(qi)(qi)在SIEMENS的(de)PLC中(zhong)，稱為(wei)SP型(xing)定(ding)時(shi)(shi)(shi)器(qi)(qi)(qi)(qi)(qi)。

擴張型脈(mo)沖定(ding)時(shi)(shi)器(qi)(qi)(qi)：這(zhe)種定(ding)時(shi)(shi)器(qi)(qi)(qi)與脈(mo)沖型定(ding)時(shi)(shi)器(qi)(qi)(qi)的區別是，只要輸入條件00000出現(xian)了(le)ON狀態(tai)，不管其持續(xu)時(shi)(shi)間多長，均可使定(ding)時(shi)(shi)器(qi)(qi)(qi)為(wei)ON的維(wei)持的時(shi)(shi)間與定(ding)時(shi)(shi)器(qi)(qi)(qi)的設定(ding)值一(yi)致(zhi)。這(zhe)種定(ding)時(shi)(shi)器(qi)(qi)(qi)在SIEMENS的PLC中，稱為(wei)SE型定(ding)時(shi)(shi)器(qi)(qi)(qi)。