S7-1200PLC如何读写时间Local real time
说起时间呀！大家第一时间想到的就是生活中的时间，那么我们工控界PLC有自己的时间吗？答：肯定是有的，不然通过PLC控制时间程序就没办法进行了，下面接下来就带大家深入了解S7-1200PLC如何读取本地Real time。一、组态博途第一步：（添加设备PLC_1 与OB1主程序、TIME DB块）https://p3-sign.toutiaoimg.com/tos-cn-i-6w9my0ksvp/5ba41776e11a4fd6a222075c7371c2ed~tplv-tt-shrink:640:0.image?lk3s=06827d14&traceid=20251227215345A8654D99C75A03D3575F&x-expires=2147483647&x-signature=cddUSmjUcR0rz9Ig89cTTiSngng%3D第二步：（在TIME DB块中建立DTL时间数据类型）日期和时间的数据类型 DTL 的操作数长度为 12 个字节，用于存储日期和时间信息https://p9-sign.toutiaoimg.com/tos-cn-i-6w9my0ksvp/4445df3602414bfda8d13aec2f0e0e39~tplv-tt-shrink:640:0.image?lk3s=06827d14&traceid=20251227215345A8654D99C75A03D3575F&x-expires=2147483647&x-signature=TaFBDgj3QQCF2aLUezJFb6YBAEc%3D
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二、编写读取时间程序第一步：（调用RD_LOC_T读取本地时间指令）https://p3-sign.toutiaoimg.com/tos-cn-i-6w9my0ksvp/ac7dc68f00cb458f8e803c6c6f36fc4f~tplv-tt-shrink:640:0.image?lk3s=06827d14&traceid=20251227215345A8654D99C75A03D3575F&x-expires=2147483647&x-signature=tv3%2BH1qyTcekq%2BxMluP1Wanqg9w%3D
第二步：（使用有条件读取当前时间）在OB1中编程，读取本地时间通过输出管脚"OUT"放入数据块相应的变量中，输出管脚"RET_VAL"为指令状态输出使用16位填写。https://p3-sign.toutiaoimg.com/tos-cn-i-6w9my0ksvp/9a8f432758d54148af11de40639764fa~tplv-tt-shrink:640:0.image?lk3s=06827d14&traceid=20251227215345A8654D99C75A03D3575F&x-expires=2147483647&x-signature=0nOOy%2B4hd5XbeXrTr2cNpMY6nmk%3D
第三步：（读取当前时间演示）https://p3-sign.toutiaoimg.com/tos-cn-i-6w9my0ksvp/5e313bd819154377ba253cd89f4bad9d~tplv-tt-shrink:640:0.image?lk3s=06827d14&traceid=20251227215345A8654D99C75A03D3575F&x-expires=2147483647&x-signature=kclxYW768SL1FzxkBw%2F7QLlrDt0%3D
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第四步：（依次读取当前时间）https://p3-sign.toutiaoimg.com/tos-cn-i-6w9my0ksvp/26c15e5f8dbd4126bfa7bfc53044e695~tplv-tt-shrink:640:0.image?lk3s=06827d14&traceid=20251227215345A8654D99C75A03D3575F&x-expires=2147483647&x-signature=LE6jePnqTwp82dVqyzS71LRTN68%3D
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三、编写写入时间程序第一步：（调用WR_LOC_T写入本地时间指令）https://p26-sign.toutiaoimg.com/tos-cn-i-6w9my0ksvp/1bf15fa8e78345c4a0baa70e59512500~tplv-tt-shrink:640:0.image?lk3s=06827d14&traceid=20251227215345A8654D99C75A03D3575F&x-expires=2147483647&x-signature=bTtZT%2Bj10YZrpl4m4jOltQ%2Br66E%3D
第二步：（使用上升沿接通WR_LOC_T指令LOCTIME填写入时间格式为：DTL#2026-12-14-14:00:00）注意事项：写入时间指令只能接通一下，如果一直接通写入，CPU时间不会变化。https://p3-sign.toutiaoimg.com/tos-cn-i-6w9my0ksvp/d01ab14317354bde87c1a6e5b614084b~tplv-tt-shrink:640:0.image?lk3s=06827d14&traceid=20251227215345A8654D99C75A03D3575F&x-expires=2147483647&x-signature=w0mHiXt0ETRjxC9ESR694drtJTM%3D
第三步：（读取写入时间，演示效果）https://p3-sign.toutiaoimg.com/tos-cn-i-6w9my0ksvp/b76f941de42542e1906c99778019eeb1~tplv-tt-shrink:640:0.image?lk3s=06827d14&traceid=20251227215345A8654D99C75A03D3575F&x-expires=2147483647&x-signature=UutO69tE5h6m%2BNlto6r0FF54cCw%3D
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以上S7-1200PLC如何读写Local real time已全部讲解完毕，你学会了嘛？
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