Allen-Bradley 4100-AEC Installation And Setup Manual page 57

48 Strobe Position For Applications Not Using the 1394 or Compact
Absolute Strobe Timing
Parameter
Tabs (absolute update cycle) = (Ts1s2 + Ts2 + Ts2hpe)
Ts1 (Strobe1 active pulse width)
Ts2 (Strobe2 active pulse width)
Ts1s2 (time from Strobe1 inactive to strobe2 active)
Tph (time from Strobe1 inactive edge to encoder state hold)
Ts1hpe (time from Strobe1 inactive to end of encoder stream)
Ts2hpe (time from Strobe2 inactive to end of encoder stream)
Tpei (*time from MSW pulse train end to incremental updating)
Thold
*Operation mode dependent: Locked or Free-Running
Publication 4100-5.2 - March 2000
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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
Absolute Position Transfer Timing
Min
100ms
5ms
Ts1+Ts1hpe+2
0
0
0
N/A
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
Locked Mode
Max
3001ms
1000ms 100ms
1000ms 5ms
2000ms Ts1+Ts1hpe+2
30ms
25ms 0
1ms 0
indefinite N/A
N/A 500ms
Free-Running Mode
Min Max
1000ms
1000ms
2000ms
30ms
25ms
1ms
N/A
500ms