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Guest magutso

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Can someone supply information on how Texas Instruments timers are programmed. I have been having problems in intepreting the infor on Texas Timers. eg TMR 900 900 OR TMR 900 0 also how can I tell the type used whether delay on , delay off etc. Also what will be the difference having normally closed/ normally open contacts on the enable signal/ reset of timer in teaxas software. Your help will be grealty appreciated CP

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As posted on Engineering Tips forum, where you asked the same question: There is no off-delay or interval timer in the TI instruction set. Only an On-delay Timer. |ENABLE |---||-----[TMR]---(Y0)-| |RESET   [900]  Set Value |---||-----[900]  Present Value If the enable line is true and the reset line is true, the timer runs and the output is on when sv=pv. If the enable line is true and the reset is false, the timer resets and the output is off. If the enable line is false and the reset is true, the timer does not run and the output is off. If the enable line is false and the reset line is false, the timer resets and the output is off. What else would you like to know?

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From Eng-Tips Forum: The following is clipped from the TI programming reference manual: "The Timer instruction (TMR) is used to time events. The timer output is turned on after the timer has timed down, making this an 'on delay' timer. A slow timer is denoted by TMR, a fast timer by TMRF. The timer times down from the preset value specified by Preset. The Preset value is stored in the TCP memory. The timers current time is stored in the TCC memory area. Timers have the following properties: · The Enable/Reset must be on for the timer to operate. · When the Start/Stop input is on and the Enable/Reset is on, the timer begins to time down. · Timing begins at the preset value Preset and continues down to zero. · If the Start/Stop input turns off and the Enable/Reset input remains on, the timer stops but it saves the current value, TCC. If the Start Stop input turns on again, the timer resumes timing. TCC is also saved if the Enable/Reset input is on and a loss of power occurs, provided the controller battery backup is enabled. · If the Enable/Reset input is turned off, the timer is reset to the preset time specified in Preset. · The output is turned on when the timer reached zero, and it stays on until the timer is reset (the Enable/Reset input is turned off).

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