Interfaces; Analog Interface Sin/Cos (1Vpp) (Bml Sf2; Additional Information About The Safe Analog Interface Sin/Cos (1Vpp) (Bml Sf2 - Balluff BML SF2-I2-GZZZ-KA Serie Betriebsanleitung

BML SF2-I2 _ _ -GZZZ - ZZZ5-...
Incremental Magnetic Encoder System
6

Interfaces

6.1 Analog interface Sin/Cos (1Vpp)
(BML SF2-_ _ _ _-G...)
This interface is described in the document
titled Interfaces for BML Magnetically Coded
Position Measuring System.
The interface document is part of this guide and
must be used!
Each of the outputs +A(+Sin)/–A(–Sin) and +B(+Cos)/–B(–
Cos) must have a load of 120 Ohm ±10%.
Parameters
Period length p [mm]
Tab. 6-1: Sin/Cos (1Vpp) interface parameters
Outputs
+A (+sin), –A (–sin)
+B (+cos), –B (–cos)
+Z, –Z
Tab. 6-2: Analog interface outputs for sin/cos (1Vpp) interface
To prevent position detection errors, do not exceed the
maximum traverse speed (see Tab. 6-3)!
Sensor type
Without reference point function or
with pole-periodic reference point
function
BML SF2-_ _0_-G...
BML SF2-_ _2_-G...
With integrated reference sensor
BML SF2-_ _1_-G...
Tab. 6-3: Maximum traverse speed for sensor head with analog
interface sin/cos (1Vpp)
20 english
Value
2
Name in the Remarks
interface
document
+A, –A
+B, –B
+Z, –Z depends on
configuration
Movement
speed [m/s]
≤ 20
≤ 10
6.2 Additional information about the safe analog
interface Sin/Cos (1Vpp) (BML SF2-_ _ _ _-G...)
BML sensors with the safe analog interface Sin/Cos
(1 Vpp) may be used in safety applications up to Safety
Integrity Level 2 (SIL 2) per EN 61800-5-2 / EN 62061 /
IEC 61508 and Performance Level d (PL d) per
EN ISO 13849-1.
The sensors provide the safety function safe incremental
value. Here safe processing and transmission of the
incremental rough position information of the measuring
system is implemented via the safe analog interface Sin/
Cos (1Vpp). For safety applications which use the function
safe incremental value only the rough position obtained
from the quadrant detection of A and B may be used.
The user must consider the entire safety chain of the safety
function (e.g. use of a safety controller) to determine the
achieved SIL and PL.
Designation
Diagnostic Coverage
Useful life
MTTFD
PFHd (EN 62061)
Performance Level
SFF Safe Failure Fraction (EN 62061)
SIL (IEC 61508)
SIL CL (EN 62061)
Safety Category (EN ISO 13849-1)
Type of sub-system (EN/IEC 61508-2)
Tab. 6-4: Safety indicators for safe analog interface Sin/Cos (1Vpp)
Value
0.99
20 years
500 years
3 E-9 1/h
d
0.99
2
2
3
B