Explicit messaging with slc – Rockwell Automation 284 ArmorStart User Manual User Manual
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9-2
Explicit Messaging on DeviceNet™
If a different I/O assembly is selected, the data size may change. It is
important to understand that the I/O assembly selected here will
directly affect the input and output mapping in the scanner’s scanlist
and the amount of Programmable Logic Controller (PLC) memory
reserved for this information.
Table 9.2
Example SLC Input Addressing (Produced Assembly)
)
Table 9.3
Example SLC Output Addressing (Consumed Assembly)
)
The example PLC program for the SLC will use the “Tripped” and
the “140M On” bit from the produced assembly and the “Fault
Reset”, “User Out A”, and “Run Fwd” bit from the consumed
assembly.
Explicit Messaging with SLC
The 1747-SDN module uses the M0 and M1 file areas for data
transfer. Only words 224 through 256 are used to execute the Explicit
Message Request and Response function. The minimum data size for
the explicit message request is 6 words and the maximum is 32
words. The following tables illustrate the standard format of the
explicit message request and response.
Table 9.4
Explicit Message Request (Get_Attribute_Single)
)
Instance 161 Default Produced Standard Distributed Motor Controller
Byte 0
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Address
I:1.23
I:1.22
I:1.21
I:1.20
I:1.19
I:1.18
I:1.17
I:1.16
Data
reserved
Reserved
reserved
Ready
Running Rev
Running Fwd
Warning
Tripped
Byte 1
Bit 15
Bit 14
Bit 13
Bit 12
Bit 11
Bit 10
Bit 9
Bit 8
Address
I:1.31
I:1.30
I:1.29
I:1.28
I:1.27
I:1.26
I:1.25
I:1.24
Data
reserved
Reserved
140M On
HOA
User In 3
User In 2
User In 1
User In 0
Instance 160 Default Consumed Standard Distributed Motor Controller
Byte
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Address
O:1.23
O:1.22
O:1.21
O:1.20
O:1.19
O:1.18
O:1.17
O:1.16
Data
User Out B
User Out A
reserved
reserved
reserved
Fault Reset
Run Rev
Run Fwd
Bit location within Word
15 … 8
7 … 0
TXID
COMMAND
Word - 0
PORT
SIZE
Word - 1
SERVICE
MAC ID
Word - 2
CLASS
Word - 3
INSTANCE
Word - 4
ATTRIBUTE
Word - 5