Output Specifications - Renishaw ATOM Installation Manual

Output specifications

Analogue output signals
All ATOM readheads and Ri and Ti analogue interfaces
Incremental 2 channels V and V differential sinusoids in quadrature,
1 2
centred ~ 1.65 V (90° phase shifted)
40/20 µm
0.7 to 1.35 Vpp with green
LED indication (readhead)
(V +)-(V -)
1 1 and 120R termination.
0°
(V +)-(V -)
2 2
Reference 1 Vpp
45°
Bi-directionally repeatable
Differential pulse V
(V +)-(V -)
360° (nom) centred on 45°
0 0
(after CAL)
Differential signals V + and V - centred on ~ 1.65 V
0 0
Set-up
(Readhead, Ri and Ti analogue)
During normal operation
3.3 V (nom)
Voltage at
V
X
0
Signal level 70%
0 50%
Between 50% and 70% signal level, V is a duty cycle, 20 µm duration.
X
Time spent at 3.3 V increases with incremental signal level.
At >70% signal level V is nominal 3.3 V.
X
During CAL routine
(Readhead, Ri analogue and Ti analogue only)
>70% signal
3.3 V
Voltage
at V
X
1.65 V
0 V
Normal operation Incremental
calibration
Start of
calibration
routine
ATOM
linear installation guide
0
100%
>70% signal
Reference Normal operation
mark
calibration
End of End of
incremental calibration
calibration routine
routine
Digital output signals
Form – Square wave differential line driver to EIA RS422A
Incremental †
2 channels A and B in quadrature (90° phase shifted)
Signal period
Resolution
A
B
Reference †
Z
Synchronised pulse Z, duration as resolution
*
Set-up
(Ti digital only)
1
Voltage
at X
0
0 Signal level 100%
Setup signal voltage proportional to incremental signal amplitude
Alarm †
Differential line driven output (Ri and Ti digital)
Line driven
E
>15 ms
Interface Interface
Alarm asserted
model when model
Ri0004
Ti
<40% signal
Ri0008
or
Ri0020
overspeed
Ri0040
Ri0100
<20% signal
Ri0200
or
>130% signal
Ri0400
3-state alarm (ACi, Ri and Ti digital)
Differentially transmitted signals forced open circuit for >15 ms when alarm conditions valid.
(Ri and Ti alarm conditions as detailed above. ACi alarm conditions: <40% signal or overspeed)
All ACi interfaces and Ri and Ti digital interfaces
Set-up
(ACi and Ri digital)
During normal operation
3.3 V (nom)
Voltage at
X
0
0 50%
Between 50% and 70% signal level, X is a duty cycle, 20 µm duration.
Time spent at 3.3 V increases with incremental signal level.
At >70% signal level X is nominal 3.3 V.
Alarm asserted
when
<20% signal
or
>135% signal
or
overspeed
Signal level 70% 100%
*
Set-up signals as shown are not present
during calibration routine
†
Inverse signals not shown for clarity
38