34 Rockwell Automation Publication 1756-PM020F-EN-P - January 2019
Name Description of Reply Data Semantics of Values
Size of masks Size in bytes of modify masks Only 1,2,4,8,12 accepted
OR masks Array of OR modify masks 1 mask sets bit to 1
AND masks Array of AND modify masks 0 mask resets bit to 0
The size of masks must be the same or smaller than the size of the data type
being accessed. For complete data integrity, the size of the mask should
match the size of the data type. For example, to avoid the possibility of a mix
of old and new data when modifying dynamic data, the size of the mask must
match the size of the data type.
See also
CIP services on page 13
Read Modify Write Tag Service on page 33
Set bit 2 and reset bit 5 of the DINT named ControlWord.
Message Request Field Bytes (in hex) Description
Request Service 4E Read Modify Write Tag Service (Request)
Request Path Size 07 Request Path is 7 words (14 bytes) long
Request Path 91 0B 43 6F 6E 7H 72 6F 6C 57 6F 72 64 00 ANSI Ext. Symbolic Segment for ControlWord
Request Data 04 00 Size of Masks (shall be 4)
04 00 00 00 Array of OR modify masks
DF FF FF FF Array of AND modify masks
Message Reply Field Bytes (in hex) Description
Reply Service CE Read Modify Write Tag Service (Reply)
Reserved 00
General Status 00 Success
Extended Status Size 00 No extended status
See also
Read Modify Write Tag Service on page 33
These are the Read Modify Write Tag Service error codes.
Error Code (Hex)
Extended Error
(Hex)
Description of Error
0x03 N/A Bad parameter, size > 12 or size greater than size of element.
0x04 0x0000 A syntax error was detected decoding the Request Path.
Read Modify Write Tag Service Error
Codes
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