Msg Instruction Setup Screen Parameters - Allen-Bradley SLC 500 Series Reference Manual
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Table 12.5 MSG Instruction Maximum Number of Elements (except Modbus RTU)
File Types
SLC 500, SLC
5/01, SLC 5/02
O, I, B, N
41
T
13
C, R
13
F
Not Applicable
St
Not Applicable
A
Not Applicable
(1)
PLC-5 type timer element maximum is 20.
(2)
PLC-5 type string element maximum is 1.
(3)
PLC-5 type timer element maximum is 208.
(4)
PLC-5 type timer element maximum is 23.
MSG Instruction Setup Screen Parameters
Parameters for This Controller
• Data Table Address
– For a Read, this is the starting address which receives the data that is
read from the target device.
– For a Write, this is the starting address of the data which is written to
the target device.
– For Modbus RTU Master, this is the starting address to receive or
send data.
• Size in Elements
– Specifies the length of the message in elements. The maximum
number of elements that are transferred via a MSG instruction is
determined by the size of the destination data type.
– For a Read, the data type in the local processor determines the
maximum number of elements.
– For a Write, the data type in the target device determines the
maximum number of elements. The maximum number of elements
that are transferred may be further limited based on the processor
type.
SLC 5/03, SLC 5/04,
SLC 5/05 Channel 1
SLC 5/05 Channel 0
Non-Multihop
103
256
(1)
(3)
34
256
34
256
51
256
25
(2)
2
103
256
SLC Communication Instructions
Multihop to SLC
Multihop to PLC-5
119
115
39
(4)
38
39
38
59
57
2
1
119
115
Publication 1747-RM001G-EN-P - November 2008
12-13
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