Modbus Protocol Mbslprt; Function Block - ABB RELION REX640 Technical Manual

Section 3
Basic functions
3.2.11
3.2.11.1
94
Table 26: Diagnostic counters and indications
Counters
Characters received
Frames received
Frames discarded
Frames transmitted
Collisions
Parity errors
Overrun errors
Framing errors
Link status
Link status

Modbus protocol MBSLPRT

Function block

MBSLPRT1
STATUS
GUID-C2A370EE-4E45-4959-9CB1-064EE23DF81E V1 EN
Figure 15: Function block
Description
Counts all incoming non-erroneous characters.
This counter operates regardless of whether the
serial driver is set to detect a whole protocol link
frame or just separate characters.
Counts all protocol-specific non-erroneous frames
received. Protocol-specific frames can be based
on timing (for example, Modbus RTU) or on
special start and stop characters (for example,
Modbus ASCII).
Counts all protocol-specific erroneous frames
received. If the driver detects an error while
receiving a frame, the whole frame is automatically
discarded. This also means that the protocol in
question never receives a faulty link frame from
the driver. When this counter is incremented, one
of the detailed error counters (Parity, Overrun,
Framing) can also be incremented.
Counts all protocol-specific frames transmitted
from the COM channel
Counts the number of transmission collisions that
have occurred. Used in RS-485 mode by some
protocols where transmissions could collide with
reception. For example, DNP3 unsolicited
reporting mode
Counts the number of parity errors detected in
characters received
Counts the number of overrun errors detected in
characters received
Counts the number of framing errors detected in
characters received
In write direction: By writing value 1 to this
parameter, all the diagnostic counters are reset to
0.
In monitoring direction: If the driver instance is in
use by any communication protocol, the
monitoring value shows value 1. Otherwise, the
value is 0.
1MRS759142 C
REX640
Technical Manual