Rockwell Automation 842D Absolute Encoder, DeviceNet Multi-Turn User Manual
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Mounting Instructions
1. Be sure to select the proper size flexible coupling clamp to
mate to the encoder shaft, e.g., 845–FC–*–*. See
Encoder Accessories in Sensors catalog.
ATTENTION: Do not rigidly connect
the encoder shaft to the machine; this
will cause premature failure of the
encoder or machine bearings. Always
use a flexible coupling.
Flexible Shaft Couplings
Angle
Parallel
OffĆSet
2. Use the dimension drawings to determine the encoder
mounting hole locations.
3. Slide the flexible coupling onto the shaft, but do not tighten
the set screws.
4. Mount the encoder and tighten with three size M4
mounting screws (not supplied).
5. Center the flexible coupling and tighten the set screws.
6. Rotate the machine slowly and verify that the flexible
coupling is not deforming beyond specifications.
7. Align machine to its mechanical zero or home position.
Remove slotted cover located on the back of the encoder
and press the preset position button to change the position
value to the preset value (the factory preset value is zero).
Replace cover.
Preset
To preset the position of the encoder, remove the slotted cover
from the back of the encoder and press the button inside.
ATTENTION: Pressing the preset position
button results in a change of position
reading. This can cause unexpected
motion which could result in damage to
the product, equipment, or personal injury.
Indicator
LED
Status
Off
Not connected not onĆline
Green Blinking
Active but not allocated by master
Green Steady
Active and allocated by master
Red Blinking
Minor fault and/or connection interrupt
Red Steady
Critical communication fault
Setting the MAC–ID (node address),
Baud Rate and Bus Termination Dip Switches
ATTENTION: Connecting this product
to an operational DeviceNet network
with improperly set DIP switches
usually will cause the entire network to
stop communicating. Baud rate setting
must be the same as the rest of the
network and the MAC–ID must be
different than the rest of the network.
Mac-ID
Preset Position
Button
Baud Rate
Bus
Termination
MAC-ID
DIP-6
DIP-5
DIP-4
DIP-3
DIP-2
DIP-1
Address
2
5
2
4
2
3
2
2
2
1
2
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
...
...
...
...
...
...
...
1
1
1
1
1
1
63
0 = DIP switch is OFF
1 = DIP switch is ON
Baud Rate
DIP-3
DIP-2
DIP-1
Baud rate
X
0
0
125 kBaud
X
0
1
250 kBaud
X
1
0
500 kBaud
X
1
1
125 kBaud
X = don’t care
0 = DIP switch is OFF
1 = DIP switch is ON