User Manual PLC-3 FAMILY I/0 Instruction Manual

Diagnostics Methods
Chapter 7
7-14
Diagnostic Counters Reset Command
Use this command to reset to zero all the diagnostic counters in the remote
station.
Command block in data table:
0005 0006 0000 0007
Response block in data table:
0000 0004 4600 1900
Table 7.F
DH
Diagnostic Counters
Byte: This counter increments when the scanner:
1 receives an ACK with a bad CRC
2 does not receive an ACK before the timeout value
3 while master, detects a message transmission by another station
(contention)
4 receives an error in the received ACK
5 adds errors in bytes 1, 2, and 4
6 receives a WAK when no receive buffer space is available at the
remote station
7 does not detect a master on the link before its timeout period expires
and so assumes mastership
8 as master, does not receive a reply from its polling sequence that has
been narrowed done to a single station
9 receives an ACK even though it does not have mastership
10 receives an illegal packet of less than 6 bytes
11 receives a packet with an incorrect destination or a packet in which the
source is equal to the destination
12 (not used)
13 receives a packet with a bad CRC
14 received a frame that was beyond the legal limit of 250 bytes
15 does not have the buffer space for a received message
16 received a message that was previously received
17 received aborted frame (line noise)
18 & 19 successfully sent a message
20 & 21 successfully received a message
22 & 23 successfully sent a command
24 & 25 successfully receives a reply
26 & 27 successfully receives command
28 & 29 successfully sends a reply
30 can not send a reply