Gram IF 4000 Manual De Uso página 391

C-2 RS485 (DSI) Protocol
Standard RS485 wiring practices apply. Termination resistors need to be
applied at each end of the network cable. RS485 repeaters may need to
be used for long cable runs, or if greater than 32 nodes are needed on the
network.
Control Terminal 16 on the PowerFlex 40 must also be connected to PE
ground (there are two PE terminals on the drive). See
information.
Parameter Configuration
The following PowerFlex 40 parameters are used to configure the drive
to operate on a network.
Parameter
P036 [Start Source]
P038 [Speed Reference]
A103 [Comm Data Rate]
A104 [Comm Node Addr]
A105 [Comm Loss Action] Selects the drive's response to communication
A106 [Comm Loss Time]
A107 [Comm Format]
Supported Modbus Function Codes
The peripheral interface (DSI) used on PowerFlex 40 drives supports
some of the Modbus function codes.
Modbus Function Code
03
06
Important: Modbus devices can be 0-based (registers are numbered
Details
Set to 5 "RS485 (DSI) Port" if Start is controlled from
the network.
Set to 5 "RS485 (DSI) Port" if the Speed Reference is
controlled from the network.
Sets the data rate for the RS485 (DSI) Port. All nodes
on the network must be set to the same data rate.
Sets the node address for the drive on the network.
Each device on the network requires a unique node
address.
problems.
Sets the time that the drive will remain in
communication loss before the drive implements A105
[Comm Loss Action].
Sets the transmission mode, data bits, parity and stop
bits for the RS485 (DSI) Port. All nodes on the network
must be set to the same setting.
Command
Read Holding Registers
Preset (Write) Single Register
starting at 0) or 1-based (registers are numbered starting at
1). Depending on the Modbus Master used, the register
addresses listed on the following pages may need to be
offset by +1. For example, Logic Command may be register
address 8192 for some master devices (e.g. ProSoft
3150-MCM SLC Modbus scanner) and 8193 for others
(e.g. PanelViews).
Table 1.H for more
Reference
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