Omega OME-ET-7000 Series, User Manual

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4.5.7. 15 (0x0F) Write Multiple Coils
This function code is used to force each coil in a sequence of coils to either ON or
OFF in an OME-ET-7000/OME-PET-7000 module. The Request PDU specifies the
coil references to be forced. Coils are addressed starting at zero.
The requested ON/OFF states are specified by contents of the request data field. A
logical ‘1’ in a bit position of the field requests the corresponding output to be ON. A
logical ‘0’ requests it to be OFF.
The normal response returns the function code, starting address, and quantity of
coils forced.
Here is an example of a request to write a series of 2 digital outputs starting at DO0:
The request data content is one byte: 02 hex (0000 0010 binary). The binary bits
correspond to the outputs in the following way:
Bit 0 0 0 0 0 0 1 0
Output - - - - - - DO1 DO0
Request Response
Field Name (Hex) Field Name (Hex)
MBAP Header
01
MBAP Header
01
02 02
00 00
00 00
00 00
06 06
Unit Identifier 01 Unit Identifier 01
Function Code 0F Function Code 0F
Starting Address Hi 00 Starting Address Hi 00
Starting Address Lo 00 Starting Address Lo 00
Quantity of Outputs Hi 00 Quantity Value Hi 00
Quantity of Outputs Lo 02 Quantity Value Lo 02
Byte Count 01
Outputs Value Lo 02