Publication 1747-RM001G-EN-P - November 2008
12-36 SLC Communication Instructions
Table 12.16 SLC 5/05 Channel 1 Read or Write, Local or Remote to a PLC-5 (with Logical ASCII/Symbolic Addressing)
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
Word 0 EN ST DN ER CO EW NR TO Error Code
Word 1 Reserved Remote Station Address (Remote only)
Word 2 Number of Elements
Word 3 Not Used
Word 4 File Type (Based on Local Source or Destination Address)
Word 5 Not Used
Word 6 Not Used
Word 7 Remote Bridge Address (Remote only) Reserved (Internal Messaging Bits) WQ
Word 8 Reserved (Internal Messaging Bits) Message Timer Preset
Word 9 Message Timer Scaled Zero
Word 10 Message Timer Accumulator
Word 11 Reserved (Internal Messaging Bits)
Word 12 AO=1 Reserved (Internal Messaging Bits)
Word 13 Reserved (Internal Messaging Bits)
Word 14 Logical ASCII Address String Length including NULL Termination Character (bytes)
Word 15 First Byte of ASCII Address String Second Byte of ASCII Address String
Word 16 Third Byte of ASCII Address String ...
... ...
... ...
Word 55 Eighty-First Byte of ASCII Address String NULL Byte of Longest ASCII Address String
Word 56
First Byte of IP Address String
(1)
Second Byte of IP Address String
Word 57 Third Byte of IP Address String ...
... ...
... ...
Word 76 Forty-First Byte of IP Address String NULL Byte of Longest IP Address String
Word 77 Not Used
Ethernet Message Type = 0
(2)
, 10h
(3)
, or 11h
(3)
Word
78
(3)
ASA Service Internal Object Identifier (IOI) Size in Words (1 to 5)
Words
79 -
83
(3)
ASA Internal Object Identifier (IOI)
Word
84
(3)
Not Used Connection Path Size in Words (1 to 8)
Words
85 -
92
(3)
Connection Path
(1)
The IP Address format is up to 42 ASCII characters including a terminating NULL character. The first byte in the array is the left most character in the string as written. For
example: If the IP Address is 423.156.78.012, the first byte is the ASCII character “4”. If the MSG destination is an INTERCHANGE client on a host computer, the
destination is specified as “client” and stored as a NULL terminated string.
(2)
Not MultiHop MSG.
(3)
MultiHop MSG.
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