If you go into the s7-1200 device properties and configure the system/clock memory and enable the system memory bits, one of them is the first scan bit. You can also create a first scan OB which is perfect for startup and reset operations. No bit required. science guy. Suggestion. WebAug 20, 2014 · 1) When the TON_1SecondTimer.Q guard bit on Network 1 was accessed 2) When the instruction was evaluated on Network 1 3) When the TON_1SecondTimer.Q bit on Network 2 was accessed So reading through the code, let's imagine the PLC is currently executing this snippet one scan before the timer is complete.

RSLogix 5000 or Studio 5000 First Scan Bit For System Initialization

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SIMATIC S7-1500 SIMATIC Controllers Siemens USA

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