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Error detection, Enable duplicate detection, Ack timeout – Rockwell Automation 1784-PM16SE SoftLogix Motion Card Setup and Configuration Manual User Manual

Page 31: Df1 point to point parameters, Enq transmit limit, Nak receive limit, Embedded responses

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Publication 1784-UM003A-EN-P – June 2003

SoftLogix Controller 23

Error Detection

Click on one of the radio buttons to specify the error detection scheme used
for all messages.

• BCC - the processor sends and accepts messages that end with a BCC

byte.

• CRC - the processor sends and accepts messages with a 2-byte CRC.

Enable Duplicate Detection

Check this box to enable duplicate message detection, which causes the object
to ignore all duplicate messages. This option is disabled by default.

ACK Timeout

Enter the time the object waits for an acknowledgment to a message
transmission. Valid values are from 0 to 65535, in 20 ms increments; the
default value is 50 ms.

DF1 Point to Point Parameters

ENQ Transmit Limit

Enter the number of inquiries you want the processor to send after an ACK
Timeout. Valid values are from 0 to 255; the default value is 3.

NAK Receive Limit

Enter the number of NAKs the processor can receive in response to a
message before stopping the transmission. Valid values are from 0 to 255; the
default value is 3.

Embedded Responses

This parameter sets the flag that enables the embedded response functionality.
Your options are:

• Autodetect – embedded responses are initiated only after one is

received.

• Enabled – embedded responses are enabled unconditionally.

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