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7. Appendix A: Technical Characteristics
Structure of the
LUFP9 gateway’s memory:
Outputs
• 2 bytes for the activation or inhibition of the downstream network by the gateway
(see chapter 5 Gateway Initialization and Diagnostics, page 33).
• 510 bytes accessible by the DeviceNet master in the form of output data (see
chapter 8.2.2 Output Data Memory Area, page 85, for the default use of this
output data).
Addresses Output data area
16#0200
16#0201
DeviceNet master command word
(unless “Control/Status Byte” = “Disabled”)
16#0202
:
Outputs accessible through the DeviceNet master
510 bytes
16#03FF 1 output data area
• 1,024 bytes inaccessible through the DeviceNet master.Structure of the
LUFP9 gateway’s memory: Addresses General data area
General data 16#0400
16#051F
Input area reserved for the Mailboxes
(288 bytes)
16#0520
16#063F
Output area reserved for the Mailboxes
(288 bytes)
16#0640
. . . . . . .
16#07BF
Internal area reserved for the management
of the upstream network (384 bytes)
(input area / output area / bi-directional area)
16#07C0
. . . . . . .
. . . . . . .
16#07FD
Internal area reserved for the control registers
(62 bytes / MSB first for 16-bit data)
(data accessible via instance 16#01
of class 16#AA: “Diagnostic Object”)
16#07FE
16#07FF
Gateway status / DeviceNet master control
(2 bytes)
You can use the general data area for Modbus input data (from Modbus
responses) if you do not want the DeviceNet master to have access to them. In
this case, always use 16{#4000 as the starting address. If you use multiple times
the same addresses in this area, the corresponding memory locations will be
displayed in red in the “General Area” section of the “Sub-network Monitor”
window (see page 51 for an example). However, this will have no consequences
on the gateway during run-time.
Data transfer order
(swapping)
• DeviceNet network: LSB first and MSB last.
• Modbus RTU network: MSB first and LSB last.
• LUFP9 gateway: MSB stored in the lowest memory address.
→In most cases, the option which should be chosen for Modbus data stored in
the gateway’s memory is “Swap 2 bytes”. This option relates to all “Data” fields
for Modbus queries and responses frames.