20
TONiC RSLM20/RELM20 Functional Safety installation guide and safety manual Original instructions
Alarm asserted when:
– Signal amplitude <20% or >135%.
– Readhead speed too high for reliable operation.
or 3-state alarm
Differentially transmitted signals forced open
circuit for >15 ms when alarm conditions valid.
Digital output signals (DOP only)
Form – Square wave differential line driver to EIA RS422A (except limits P and Q)
Alarm
†
Line driven
(Asynchronous pulse)
Limits
Open collector output, asynchronous pulse
Repeatability <0.1 mm
Length of limit actuator
P Q
Active high or Active low
P Q
Repeatability <0.1 mm
Length of limit actuator
Incremental
†
2 channels A and B in quadrature (90° phase shifted)
Reference
†
Signal period
Resolution
A
B
Z
Z
Bi-directionally repeatable pulse Z, duration equal to the resolution
Bi-directionally repeatable pulse Z, duration equal to the signal period
Wide reference
†
E
>15 ms
DOP set-up
*
0
Voltage
at X
1
100%
0
Signal level
Set-up signal voltage proportional to incremental signal amplitude
NOTE:
Select ‘standard’ or ‘wide’ reference at time of ordering, to match the requirements of the controller being used.
20 µm
45°
Output specifications
Analogue output signals
Incremental
2 channels V
1
and V
2
differential sinusoids in quadrature (90° phase shifted)
(V
1
+) − (V
1
−)
(V
2
+) − (V
2
−)
Bi-directionally repeatable.
Differential pulse V
0
, centred on 45°.
(V
0
+) − (V
0
−)
Reference
0.8 to 1.2 Vpp
360° (nominal)
0°
Limits
Open collector output, asynchronous pulse
Ti0000 interface only
Repeatability <0.1 mm
Length of limit actuator
V
p
V
q
T301
x
readhead only
Active low
V
p
V
q
Repeatability <0.1 mm
Length of limit actuator
Active high
Ti0000 set-up
*
Voltage
at V
X
3.3 (nom)
0
Between 50% and 70% signal level, V
X
is a duty cycle.
Time spent at 3.3 V increases with incremental signal level.
At >70% signal level V
X
is nominal 3.3 V.
NOTE:
Ti0000 interface contains a transistor to invert the readhead’s ‘active low’ signal to give an ‘active high’ output.
*
Set-up signals as shown are not present during calibration routine.
†
Inverse signals not shown for clarity.
0.7 to 1.35 Vpp with Green LED
indication (readhead) and 120R
termination.
Centred on 1.65 V.
NOTE:
DOP centred on 2.5 V.
0
50% Signal level
70% 100%
Differential signals V
0
+ and V
0
− centred on ~1.65 V
NOTE:
DOP centred on 2.5 V.