Operating Instructions

Chapter 4 - Parameters and Menu Structure
I/O and Hardware (M5)
139 | 187
Siemens Industry, Inc.
Siemens BT300 HVAC Drive
DPD01809
Smart Infrastructure
2019-05-29
Logically, the P1 FLN is a master-slave protocol, with the supervisory controller being the master. Device
points are partitioned into common HVAC control types, such as analog input, analog output, digital input, and
digital output. P1 FLN messaging supports the reading, writing and overriding of these points.
The P1 FLN fieldbus protocol supports the following point types:
● Logical Digital Input (LDI) – a two-state input for reading status.
● Logical Digital Output (LDO) – a two-state output for commanding.
● Logical Analog Input (LAI) – a floating or multi-state input for status.
● Logical Analog Output (LAO) – a floating or multi-state output for commanding.
Each point type supports Change of Value (COV) reporting based on the point’s present value, priority, and
status (failed or normal). The output points are typically commandable from the P1 master panel where the
input points are for monitoring purposes only.
If Protocol (5.8.1.1) is set to a value of P1, then configuration and status parameters related to the P1
fieldbus protocol are made available.
Parameters (M5.8.3.1)
The following configuration parameters are available for the P1 fieldbus protocol:
Table 103: P1 FLN Parameters.
Menu
Parameter
ID
Unit
Min
Max
Default
Description
P5.8.3.1.1
Slave Address
2534
0
127
99
Defines the unique slave address to
be used by the drive on the P1
network. Broadcast messages are
sent to device number 99 and all
devices on the network respond to
this address; therefore, address 99 is
a reserved address and cannot be
used on any device on the network.
P5.8.3.1.2
Baud Rate
2535
bps
4800
9600
4800
Defines the communications speed
on the network which must match all
devices on the network. Possible
settings are:
1 = 4800
2 = 9600
P5.8.3.1.3
Communications Timeout
2536
s
0
65535
30
Defines the amount of time in which
a packet is not received from the
master before a communications
timeout is faulted/alarmed. A setting
of 0 means that no fault is
generated.
Monitoring (M5.8.3.2)
The following monitoring values are available for the P1 fieldbus protocol:
Table 104: P1 FLN Monitoring.
Menu
Parameter
ID
Min
Max
Description
M5.8.3.2.1
Fieldbus Protocol Status
2537
Initializing
Faulted
Displays the current protocol status as follows:
0 = Initializing – Protocol is starting up.
1 = Stopped – Protocol is timed out or not in use.
2 = Operational – Protocol is running normally.
3 = Faulted – Major fault in protocol, requires restarting.
If fault remains, contact Technical Support.