HEIDENHAIN PWM 20 - Manual (Page 136)

November 2014 Software description 137
Functional Safety
Note:
The consistency of the values is tested during the "Functional Safety" check. Thus, the values
displayed here are for information only.
For position comparison there are two relevant types, i.e. "binary" and "non-binary. This refers
to the ratio of X_IST1 and Pos2. Linear encoders normally are "non-binary", rotary and angle
encoders "binary".
Relevant Pos2 bits:
Number of bits of position 2 that are used in the safety comparison algorithm. Only when an
encoder with binary position comparison is used, is the value not zero.
Offset Pos1-Pos2:
Offset between position 1 (X_IST1) and position 2 in the resolution of position 2
nsrPos1:
Non-safety-relevant measuring steps of position 1 (X_IST1); usually not supported on encoders
with binary position comparison.
nsrPos2:
Non-safety-relevant measuring steps of position 2; usually not supported on encoders with
binary position comparison.
srM:
Safety-relevant measuring steps that are taken into account for position comparison;
usually not supported on encoders with binary position comparison.
Offset2:
Offset between position 1 (X_IST1) and position 2 in the resolution of position 1 (X_IST1);
usually not supported on encoders with binary position comparison.
Further information
Encoder datum shift:
If a datum shift is programmed in the encoder, this value is displayed here.
Size of OEM memory in bytes:
Size of the memory range reserved for information by the OEM
TIME2LINK_OK MAX in ms:
Maximum time after which the encoder can communicate via DRIVE-CLiQ; if no value is
displayed, the switch-on time tSOT applies (stated in the catalog).
T_MAX_ACT_VAL in µs:
This value is the earliest transmission time of a DRIVE-CLiQ package after position latch.