Siemens SIMATIC S5 Equipment Manual

General Function Description
R 02/92
1.8.2 Conditions
Incremental encoder:
1. The zero mark of the encoder and the preliminary contact define the end value of the rotary
axis. The encoder must be selected in accordance with the rotary axis requirements, or the zero
mark and the preliminary contact must be transferred to the
1P 241 accordingly.
Example:
Desired area O to 359 (360 positions)
The zero mark with the preliminary contact appears exactly with pulse 360
(i.e., 359 is followed by the actual value O).
2. The preliminary contact, required for synchronizing of incremental encoders, and the zero mark
must be active at the zero position at each revolution. This means that in case of continuous
conveyors, the application of the respective
prelimina~ contact is also required when the en-
coder crosses zero. This is one reason why absolute encoders are used for continuous con-
veyors. Another reason is that often no reference point traversing can be realized with a continu-
ous conveyor.
Absolute encoders:
The encoder end value defines the end value of the rotary axis.
This means that the encoder must be selected in accordance with the rotary axis requirements or
that a programmable encoder must be used.
Example:
Desired area Oto511
An encoder with512 position resolution is selected.
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1P 241 Equipment Manual
@ .Siemens AG 1989, Order No: 6E.S5 998-0KD21
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Siemens SIMATIC S5 Specifications

General

Product type designation	SIMATIC S5
Programming language	STEP 5
Digital inputs	Varies by model
Digital outputs	Varies by model
Analog inputs	Varies by model
Analog outputs	Varies by model
Supply voltage	24V DC
CPU Type	Varies by model
Memory	Varies by model
Digital I/O	Varies by model
Analog I/O	Varies by model
Communication	PROFIBUS
Operating Temperature	0°C to 60°C
Relative Humidity	5% to 95% (non-condensing)