ifm electronic RN3001 - Manual (Page 21)

UK
Encoder with Profibus interface
21
10.3.1 Set the direction of rotation
The direction of rotation cannot be changed online in the set-up mode� The current
direction of rotation is displayed via bit 28 in the input double value (0: increasing/
1: decreasing clockwise)� The direction of rotation can be changed via bit 28 in the
output double word�
Status bits Data bits
Bit 31 30 29 28 27 26 25 24���1 0
Master
→ encoder
0 0 0 1 0 0 0 Select the direction of rotation
via bit 28
Encoder
→ master
0 0 0 0/1 0 0 1 The encoder acknowledges the new
direction of rotation in bit 0 and bit 28
0/1
Master
→ encoder
0 0 0 0 0 0 0 The selection is terminated by resetting
bit 28
Encoder
→ master
0 0 0 0/1 X 0 1 Output of the process actual value
with changed direction of rotation
The set direction of rotation is saved in the EEPROM non-volatilely�
10.4 Start teach operation
► Move the system to the starting position�
► Transmit the start command for the teach operation to the encoder�
> The device starts the measurement to determine the gearbox factor internally�
Status bits Data bits
Bit 31 30 29 28 27 26 25 24���0
Master
→ encoder
0 1 0 0 0 0 0 Start of the teach operation by setting bit 30
Encoder
→ master
0 1 0 X X 0 1 Encoder acknowledges the start of the teach
operation by setting bit 30
Master
→ encoder
0 0 0 0 0 0 0 Reset bit 30
Encoder
→ master
0 1 0 X X 0 1 Output of the non-processed actual value
(gearbox factor = 1, preset not active)
10.4.1 Stop teach operation
► Transfer the requested number of steps to the encoder with the "stop teach
operation" command�
► Do not exceed the physical resolution (e�g� 20000 steps on a quarter of a
revolution)�