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System description - Pilz GmbH & Co.

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Module<br />

<strong>Co</strong>unter modules (failsafe)<br />

PSSu K F INC<br />

Function <strong>description</strong><br />

][Funktionsbeschreibung Supply<br />

Module supply<br />

The module supply provides the<br />

module with voltage.<br />

][Funktionsbeschreibung_Ein ST-INC<br />

The module has two operating modes:<br />

Incremental encoder (default)<br />

<strong>Co</strong>unter<br />

In incremental encoder mode the<br />

module evaluates inputs A and B. In<br />

counter mode, only the rising edges at<br />

input A are counted. The user can define<br />

the operating modes and any additional<br />

options using the system<br />

software<br />

In both operating modes, the counter<br />

status and the status of the latch<br />

memory are each transmitted to the<br />

head module via the module bus with<br />

a 32 bit data word. The module sends<br />

additional status information.<br />

The module has three dual-pole, differential<br />

inputs (A, B, C) and three single-pole<br />

inputs referenced to earth (G,<br />

L, S). Signals with +/- 5 V are connected<br />

to the dual-pole inputs in accordance<br />

with RS 422.<br />

The single-pole inputs are used for<br />

special functions. Inputs G and L may<br />

be connected to external signal sources,<br />

e.g. to a higher order control system.<br />

Input G (gate input)<br />

The counter is stopped with a 1 signal.<br />

Input L (input for external latch<br />

pulse)<br />

At a rising edge, the module stores<br />

the current counter value in the<br />

latch memory upon request.<br />

Input S (input for external status)<br />

The encoder's fault signal output<br />

can be connected to the status input.<br />

The module transmits the input<br />

status to the head module with the<br />

status information.<br />

Additional module functions:<br />

<strong>Co</strong>unter overflow<br />

Period length measurement<br />

The resolution is 200 ns.<br />

Set counter status<br />

Incremental encoder operating<br />

mode<br />

The counter outputs and the output for<br />

the incremental encoder's zero pulse<br />

are connected to the dual-pole inputs.<br />

Inputs A, B<br />

The first channel of the encoder is<br />

connected to input A, the second to<br />

input B.<br />

Input C<br />

The output for the incremental encoder's<br />

zero pulse is connected to<br />

input C. Upon request, the module<br />

stores the counter value at the time<br />

of the zero pulse in the latch memory.<br />

<strong>Co</strong>unter operating mode<br />

In counter mode the module's dualpole<br />

differential inputs A, B, C have<br />

different functions to those of incremental<br />

encoder mode.<br />

Input A (<strong>Co</strong>unt)<br />

Input A is used to connect the<br />

counter pulses.<br />

Input B (Up/down)<br />

At a 0 signal the module counts forwards.<br />

At a 1 signal the module<br />

counts backwards.<br />

Input C (Gate/Latch)<br />

The counter is stopped with a 1 signal.<br />

Upon request, the module<br />

stores the current counter value in<br />

the latch memory.<br />

The single-pole inputs have the same<br />

function in both operating modes.<br />

Wiring<br />

][Verdrahtung ST INC K Trumph<br />

The module's connections are galvanically<br />

isolated from the module<br />

supply and periphery supply.<br />

For EMC reasons we recommend<br />

that you operate inputs A, B, C exclusively<br />

as differential inputs with<br />

inverted signals (A+/A-, B+/B-, C+/<br />

C-).<br />

The module evaluates open differential<br />

inputs (A+/A-, B+/B-, C+/C-)<br />

as a 1 signal.<br />

The module evaluates open function<br />

inputs (G, L, S) as a 0 signal.<br />

Use twisted pair cables to carry the<br />

inverted signals. This will increase<br />

the noise immunity.<br />

Use shielded signal cables with metallic<br />

plugs. The screening should<br />

be connected to the housing of the<br />

D-Sub connector.<br />

The channel for the incremental encoder's<br />

zero pulse has a different<br />

designation depending on the manufacturer<br />

(N, C, Z, 0,...)<br />

The supply voltages must be extra<br />

low voltages with safe electrical<br />

separation (PELV or SELV) in accordance<br />

with VDE 0100, Part 410.<br />

Use copper wiring.<br />

][Verdrahtung FS INC_ABS_Sensoren<br />

<strong>Co</strong>nnect the two sensors via separate<br />

cables. This also applies to<br />

compact encoders.<br />

<strong>Pilz</strong> <strong>GmbH</strong> & <strong>Co</strong>. KG, Felix-Wankel-Straße 2, 73760 Ostfildern, Germany<br />

Telephone: +49 711 3409-0, Telefax: +49 711 3409-133, E-Mail: pilz.gmbh@pilz.de<br />

PSSu-2012-06

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