User Guide

Honeywell • 14 PROGRAMMING
P5.8.3.1.6 MAXAPDUCYCLE
This parameter defines the maximum time in seconds between APDU messages addressed to
this node. The APDU messages are Application layer messages, for example, 'ReadParame-
ter' and 'Write Parameter' messages. This can be used to detect communication loss to the
controlling node.
NOTE! The application parameter P3.9.1.6 (ID 733) can be used to define the action for com-
munication timeout.
4.3.2 BACnet MS/TP monitoring values
V5.8.3.2.1 F
IELDBUS PROTOCOL STATUS
Fieldbus Protocol Status tells the status of the protocol.
V5.8.3.2.2 C
OMMUNICATION STATUS
The Communication status shows how many error and how many good messages the AC drive
has received. The Communication status includes a common error counter that counts CRC
and parity errors and a counter for good messages.
Only messages to the current slave in use are counted in the good messages, not MS/TP token
packages.
V5.8.3.2.3 A
CTUAL INSTANCE NUMBER
Shows the actual instance number.
V5.8.3.2.4 L
AST FAULT
This monitor value consist of text string that gives extra information about the fault condition.
Can be used to track the reason for communication timeout. See Table 8.
V5.8.3.2.5 U
ARTDBG
This is advanced debug information from RS-485 uart module. It shows parity, framing and
overrun errors occurred while receiving the MSTP messages.
V5.8.3.2.6 A
CTIVECOVCOUNT
This shows the number of active COV subscriptions on the device.
Good messages
0…999 Number of messages received without
errors
Bad Frames
0…99 Number of messages received with
errors