Rockwell-automation 4100 AEC Absolute Encoder Converter Installation Manual de usuario descargar pdf (Pagina 56)

Publication 4100-UM052B-EN-P - October 2001

48 Strobe Position For Applications Not Using the 1394 or Compact

Absolute Strobe Timing

This section defines the timing requirements for the two-strobe pulse

train required for absolute position updates. The AEC must receive

two strobe pulses to initiate and complete an absolute position update

transfer. These are referred to as Ts1 and Ts2 in the data transfer

protocol diagram. The following diagram and table outline the

parametric requirements for an absolute position update cycle.

Figure 18 Absolute Position Transfer Protocol

An absolute position request is an asynchronous event initiated by

the controlling hardware. The first strobe starts the absolute position

update cycle. The first strobe (Ts1) must be active for a minimum of

100ms, but for less than 1000ms to be valid. A strobe is sourcing

Absolute Position Transfer Timing

Parameter Locked Mode Free-Running Mode

Min Max Min Max

Tabs (absolute update cycle) = (Ts1s2 + Ts2 + Ts2hpe) 3001ms

Ts1 (Strobe1 active pulse width) 100ms 1000ms 100ms 1000ms

Ts2 (Strobe2 active pulse width) 5ms 1000ms 5ms 1000ms

Ts1s2 (time from Strobe1 inactive to strobe2 active) Ts1+Ts1hpe+2 2000ms Ts1+Ts1hpe+2 2000ms

Tph (time from Strobe1 inactive edge to encoder state hold) 30ms 30ms

Ts1hpe (time from Strobe1 inactive to end of encoder stream) 0 25ms 0 25ms

Ts2hpe (time from Strobe2 inactive to end of encoder stream) 0 1ms 0 1ms

Tpei (*time from MSW pulse train end to incremental updating) 0 indefinite N/A N/A

Thold N/A N/A 500ms 500ms

*Operation mode dependent: Locked or Free-Running

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Rockwell-automation 4100 AEC Absolute Encoder Converter Installation Manual de usuario Pagina 56