Rockwell Automation 20-COMM-S RS-485 DF1 Adapter - Manual (Page 25)

Configuring the Adapter 3-5
Two types of error checking methods are used with the DF1 protocol,
Cyclic Redundancy Check (CRC) and (BCC).
1. Set the value of Parameter 24 - [CRC/BCC] to the method used by
the network.
Figure 3.4 RS-485 DF1 CRC/BCC Screen on a LCD HIM
By default, when communications are disrupted (for example, a cable is
disconnected) or the scanner is idle, the drive responds by faulting if it is
using I/O from the network. You can configure a different response to
communication disruptions using Parameter 10 - [Comm Flt Action].
Setting the CRC/BCC Selection
Value Selection
0
BCC (default)
1 CRC
Port 5 Device
20-COMM-S
Parameter #: 24
CRC/BCC Cfg
0
BCC
Setting a Fault Action
!
ATTENTION: Risk of injury or equipment damage exists.
Parameter 10 - [Comm Flt Action] lets you determine the action of
the adapter and connected drive if communications are disrupted. By
default, this parameter faults the drive. You can set the parameter so that
the drive continues to run. Precautions should be taken to ensure that
the setting of this parameter does not create a risk of injury or
equipment damage.