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 174
▪ The Number Of Analog Inputs value is two bytes in length. It must contain a value
from 1 to 125 inclusive. The sum of the Starting Analog Input value and the Number
Of Analog Inputs value must be less than or equal to the highest analog input
number available in the at-attached CPU. The high order byte of the Starting Analog
Input Number and Number of Analog Inputs 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.
6.3.3.4.3 Response:
The Byte Count is a binary number from 2 to 250 inclusive. It is the number of bytes in the
normal response following the byte count and preceding the error check. Note that the
Byte Count is equal to two times the number of analog inputs returned in the response. A
maximum of 250 bytes (125) analog inputs is set so that the entire response can fit into
one 256-byte data block.
The analog inputs are returned in the Data field in order of number with the lowest
number analog input in the first two bytes and the highest number analog input in the
last two bytes of the Data field. The number of the First Analog Input in the Data field is
equal to the Starting analog input number plus one. The high order byte is sent before the
low order byte of each analog input.
6.3.3.5 Message (05): Force Single Output
6.3.3.5.1 Format:
Figure 27: RTU Force Single Output Message Format
Address
Point
Number
Data
Error Check
Func
05
Query
Hi
Hi
Lo
Lo
Normal Response
00H
Address
Point
Number
Data
Error Check
Func
05
00H
Hi
Hi
Lo
Lo
6.3.3.5.2 Query:
▪ An Address of 0 indicates a broadcast request. All slave stations process a broadcast
re-quest and no response is sent.
▪ The function code is equal to 05.

Emerson PNC001-A Series Specifications

General

Brand	Emerson
Model	PNC001-A Series
Category	Controller
Language	English