Siemens Simatic S7 Series System Manual

Open loop motion control
12.2 Using motion control
S7-200 SMART
486 System Manual, 09/2015, A5E03822230-AC
Motor data sheets have different ways of specifying the start/stop (or pull-in/pull-out) speed
for a motor and given load. Typically, a useful SS_SPEED value is 5% to 15% of the
MAX_SPEED value. To help you select the correct speeds for your application, refer to the
data sheet for your motor. The following figure shows a typical motor torque/speed curve.
①
Torque required to drive the load
②
Motor torque versus speed characteristic
③
Start/Stop speed versus torque: This curve moves towards lower speed as the load inertia
increases.
④
Maximum speed that the motor can drive the load: MAX_SPEED should not exceed this value.
⑤
Start/Stop speed (SS_SPEED) for this load
12.2.2
Entering the acceleration and deceleration times
As part of the configuration, you set the
acceleration and deceleration times. The
default setting for bot
h the acceleration
time and the deceleration time is 1 se
c-
ond. Typically, motors can work with
less than 1 second. See the following
figure.
① MAX_SPEED
② SS_SPEED
③ ACCEL_TIME
④ DECEL_TIME
Note
Motor acceleration and deceleration times are determined by trial and error. You should start
by entering a large value. Optimize these settings for the application by gradually reducing
the times until the motor starts to stall.

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.