TEWS TPMC117 6 Channel SSI, Incremental Encoder, Counter

Application Information

The TPMC117 is a standard single-width 32 bit PMC

module and offers six independent channels. Each of

these channels can operate as a standard SSI interface

controller, in a SSI ‘Listen only’ Mode, as an incremental

encoder or general purpose counter.

The standard SSI interface controller outputs a clock burst

to the absolute encoder and receives the returned

positional data. The SSI interface controller operates with

a programmable clock rate from 1µs to 15µs and

programmable data word length from 1 bit to 32 bit.

In ‘Listen only’ Mode the channel listens to an existing SSI

interface to observe its data transfer. It takes both the SSI

clock and data as inputs. In ‘Listen only’ Mode the channel

also has a programmable data word length from 1 bit to 32

bit; the SSI clock rate of the observed SSI interface can be

in the range of 1µs to 15µs.

In both modes the data word can be encoded in Binary- or

in Gray code and with odd, even or no parity.

The 32 bit incremental encoder counter is a preloadable

up- and down counter. The counter is programmable for

single, double and quadruple analysis of the encoder

signals. In conjunction with the isolated 24V digital inputs it

provides the possibility of automatic preload of the counter

whenever the motion system passes a reference position.

The 32 bit general purpose preloadable up- and down

counter can be fed with an internal clock or with external

signals.

Both counter modes offer a 32 bit preload register, a 32 bit

compare register and various count modes.

A 'Multiple Channel Read' function latches the actual

values of all enabled channels whose values can then be

read without interfering with normal function.

In addition the TPMC117 provides a 16 bit down-counter

with preload register which allows timing intervals of up to

65ms. It can be used as reference timer for closed loop

applications or as trigger for the Multiple Channel Read

function.

All data inputs are isolated. The level of the input signals

can be RS422 or TTL. The input signals pass a digital filter

for noise suppression before they are further used.

The level of the SSI clock output signals is RS422.

Each of the six motion control channels of the TPMC117

offers one isolated 24V digital input. The input circuit

ensures a defined switching point and polarization

protection against confusing the pole. The input has an

electronic debounce circuit. All six 24V digital inputs can

generate an interrupt, triggered on rising or falling edge.

Depending on the selected mode the input can be used as

general purpose input or reference input.

All TPMC117-10R signals are accessible through a HD68

SCSI-3 type front I/O connector. The TPMC117-20R offers

P14 back I/O and a dummy front panel.

The TPMC117 can operate with 3.3V and 5.0V PCI I/O

signaling voltage.

Software Support (TDRV005-SW-xx) for different

operating systems is available.