Rockwell Automation 1771-DMC_DMC1_DMC4_DXPS Control Coprocessor User Manual - Manual (Page 202)

API Library of Routines
Appendix B
DTL_RMW_W
B-71
Returns
Status Symbolic Name Meaning
0 DTL_SUCCESS Operation successful
15 DTL_E_R_ONLY Data item defined as READ only
16 DTL_E_INVTYPE Data is invalid type for operation
19 DTL_E_NOINIT DEFINE table not initialized
20 DTL_E_BADID Definition ID out of range
24 DTL_E_FAIL I/O completed with errors
31 DTL_E_TOOBIG Data item greater than maximum allowed
32 DTL_E_NODEF No such data item defined
41 DTL_E_CNVT DataĆconversion error, I/O not attempted
157 CC_E_NOTCONNECT PLC is not connected or offline
Description
Use the DTL_RMW_W function to perform a read/modify/write function
on a data item. The function reads a data value, modifies the data with the
AND mask and then with the OR mask, and writes the data back to the
programmable controller.
This synchronous function cannot be used on multiple-element data
definition. The element must be a word value.