Simolink Functionality - Siemens SIMOVERT MASTERDRIVE SLE Operating Instructions Manual

Description
2.1

SIMOLINK functionality

2-2
02.2001
The incoming optical signals from the fiber-optic cable are converted to
electrical signals by means of fiber optic receivers on all SIMOLINK
modules and then transferred to the fiber-optic transmitter where they
are converted back to optical signals. The propagation delays caused
by this process are calculated while SIMOLINK is booting and the dead
times compensated accordingly for active SIMOLINK nodes. The
receive information is derived, depending on parameterization, from the
buffered, electrical signals and transferred with the SYNC interrupt (last
telegram in SIMOLINK polling). The transmit information of the node is
transferred in the opposite direction and written to the associated
telegrams (electrical signals).
The SIMOLINK Encoder is incorporated in the SIMOLINK ring like a
SIMOLINK slave; it is an active node and included in the dead-time
calculation. It returns its actual angle output and status via the
SIMOLINK. Its SIMOLINK addresses (node address and receive
address) are set via the DIL switches on the right-hand housing panel.
The telegram of the set receive address (dispatcher mode: address of
SIMOLINK node which transmits the setpoint) and receive channel
contains the 15-bit-wide angle setpoint (0...32767, i.e. 360° of one
encoder revolution is resolved with approximately 0.01°), an offset of
the SIMOLINK Encoder zero pulse as well as an output enable control
bit.
The position of the zero pulse of the SIMOLINK Encoder need not
coincide with the zero position of the setpoint. This offset is managed
by the transmitting node, sent to the SIMOLINK Encoder as a setting
value and loaded when enabled.
The setpoint resolution of 32768 corresponds to 8192 encoder pulses
per revolution (pulse quadruplication is needed to ensure a correct
signal sequence of edge changes on tracks A and B). Other possible
pulse numbers per revolution (4096, 2048, 1024) are obtained by
frequency division. The rated speed of the SIMOLINK Encoder is 25
revolutions of the electrical shaft per second (rated output frequency:
204.800 kHz with 8192 pulses); the SIMOLINK Encoder is capable of
outputting 125 % correctly (maximum output frequency: 256.000 kHz)
and the output pulses are recorded as an actual value via a counter.
The SIMOLINK Encoder has an internal controller which accepts the
new position setpoint from the receive telegram with every SYNC
interrupt. It uses this and its own actual value to calculate a
manipulated variable (number of pulses to be output for the next
SIMOLINK cycle, i.e. frequency setpoint) for the frequency generator.
The SIMOLINK Encoder operates only in the SIMOLINK dispatcher
mode, with cycle times of 1.6 ms or 3.2 ms (dispatcher mode means
exactly 251 SIMOLINK telegrams in 1.6 ms cycle or 503 SIMOLINK
telegrams in 3.2 ms cycle).
SLE / SLE-DP – SIMOLINK Encoder
GWE-477 763 4070.76 J
Operating Instructions SIMOVERT MASTERDRIVES
Siemens AG