Emerson PNC001-A Series User Manual

PACSystems™ RX3i and RSTi-EP CPU Reference Manual Section 6
GFK-2222AK October 2019
Serial I/O, SNP & RTU Protocols 179
6.3.3.10 Message (15): Force Multiple Outputs
6.3.3.10.1 Format:
Figure 31: RTU Force Multiple Outputs Message Format
Address
Number
of Points
Error Check
Func
15
Query
Normal Response
Address
Error Check
Func
15
Byte
Count
Data
Starting
Point
Point No.
Number
of Points
Starting
Point
Point No.
6.3.3.10.2 Query:
▪ An Address of 0 indicates a broadcast request. All slave stations process a broadcast
request and no response is sent.
▪ The value of the Function code is 15.
▪ The Starting Point Number is two bytes in length and may be any value less than the
highest output point number available in the attached CPU. The Starting Point
Number is equal to one less than the number of the first output point forced by this
request.
▪ The Number of Points value is two bytes in length. The sum of the Starting Point
Number and the Number of Points value must be less than or equal to the highest
output point number available in the attached CPU. The high order byte of the
Starting Point Number and Number of Bytes fields is sent as the first byte in each of
these fields. The low order byte is the second byte in each of these fields.
▪ The Byte Count is a binary number from 1 to 256 (0 = 256). It is the number of bytes
in the Data field of the force multiple outputs request.
▪ The Data field is packed data containing the values that the outputs specified by the
Starting Point Number and the Number of Points fields are to be forced to. Each byte
in the Data field contains the values that eight output points are to be forced to. The
least significant bit (LSB) of the first byte contains the value that the output point
whose number is equal to the starting point number plus one is to be forced to. The
values for the output points are ordered by number starting with the LSB of the first
byte of the Data field and ending with the most significant bit (MSB) of the last byte
of the Data field. If the number of points is not a multiple of 8, then the last data byte
contains zeroes in one to seven of its highest order bits.

Emerson PNC001-A Series Specifications

General

Brand	Emerson
Model	PNC001-A Series
Category	Controller
Language	English