Siemens bt300 Operator's Manual page 139

Communication Time-out (P5.8.3.1.5)
The Modbus board initiates a communication error for a time defined with this parameter. 0 means that no fault is
generated.
Modbus RTU Monitoring Values
Fieldbus Protocol Status (P5.8.3.2.1)
Field Protocol Status indicates the status of the protocol.
Communication Status (P5.8.3.2.2)
The Communication Status shows how many errors and how many good messages the variable frequency 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.
This parameter displays as
For example, 01.002 would represent one bad frame and two good messages.
Illegal functions (P5.8.3.2.3)
The function code received in the query refers to an invalid action for the server (or slave).
Illegal data addresses (P5.8.3.2.4)
The data address received in the query refers to an invalid address for the server (or slave).
Illegal data values (P5.8.3.2.5)
A value contained in the query data field refers to an invalid value for server (or slave).
Slave device busy (P5.8.3.2.6)
The server (or slave) is engaged in processing a long–duration program command. The client (or master) should
retransmit the message later when the server (or slave) is free.
Memory parity error (P5.8.3.2.7)
The server (or slave) attempted to read record file but detected a parity error in the memory.
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Table 107: Parity Type.
Parity Type
Even 1
Odd 1
None 2
Table 108: FB Protocol Statuses.
INITIALIZING Protocol is starting up.
STOPPED Protocol is timed out, or not used.
OPERATIONAL Protocol is running.
FAULTED Major fault in protocol, requires restarting. If fault
persists, contact Technical Support.
xx.yyy xx
where indicates bad frames and
Siemens BT300 HVAC Drive
Chapter 4 - Parameters and Menu Structure
Stopbits
yyy
indicates good messages.
I/O and Hardware (M5)
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DPD01809
2016-06-07