Siemens Simatic S7 Series User Manual

53
In the following timer example, when input I0.3 turns on, the
I0.3 contact closes, and timer T37 begins timing. T37 has a time
base of 100 ms (0.1 seconds). The preset time (PT) value has
been set to 150. Because the resolution of the timer is set to
100 ms, a preset value of 150 is equal to 15 seconds (150 x 100
ms). Therefore, 15 seconds after the I0.3 contact closes, timer
bit T37 becomes a logic 1, the T37 contact closes, and output
coil Q0.1 and its associated output point turn on.
If the switch opens before 15 seconds has elapsed, the
accumulate time resets to 0. Because this type of timer does
not retain its accumulated time when its input (IN) goes to logic
0, it is said to be non-retentive.
T37
+150
I0.3
Q0.1
TON
T37
IN
PT
100 ms
Preset time = 150 x 100 ms = 15 seconds
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Siemens Simatic S7 Series Specifications

General

CPU	Varies by model (e.g., S7-300, S7-400, S7-1200, S7-1500)
Communication Interfaces	PROFIBUS, PROFINET, Ethernet, MPI
Programming	TIA Portal, STEP 7
Programming Languages	LAD, FBD, STL, SCL, GRAPH
I/O Modules	Digital, Analog, Specialty modules available
Operating Temperature	0°C to 60°C (standard models)
Mounting	DIN rail mounting
Operating Voltage	24V DC or 120/230V AC (varies by model)
Protection Class	IP20 (standard models)
Memory	Varies depending on the S7 model. Includes work memory (RAM) for program execution, load memory (EEPROM or Flash) for program storage, and system memory for operating system functions. Memory sizes range from kilobytes to megabytes.