Rtu Scratch Pad - Emerson PACSystems RX3i User Manual

PACSystems™ RX3i and RSTi-EP CPU Reference Manual
GFK-2222AK
6.3.4

RTU Scratch Pad

The entire scratch pad is updated every time an external READ request is received by the
PACSystems RTU slave. All scratch pad locations are read only. The scratch pad is a byte-
oriented memory type.
6.3.4.1 RTU Scratch Pad Memory Allocation
SP Address Field Identifier
00 CPU Run Status
01 CPU Command Status
02
CPU Type
03
04 – 0B CPU SNP ID
0C
CPU Firmware Revision No.
0D
0E Communications Management
0F Module (CMM) Firmware Revision No.
10—11 Reserved
12 Node Type Identifier
13—15 Reserved
16 RTU Station Address
17 Reserved
18—33 81 Sizes of Memory Types
18—1B Register Memory
1C—1F Analog Input Table
20—23 Analog Output Table
24—27 Input Table
28—2B Output Table
2C—2F Internal Discrete Memory
30—33 User Program Code
34—FF Reserved
78 0000 = Run_Enabled
0010 = Stopped
79
CPU Major Type Codes: PACSystems 0x43
80 PACSystems Minor Types for CPU: refer to Message (17): Report Device Type
81 Four bytes hold the hexadecimal length of each memory type with the most significant word reserved for future expansion. For example, the
default register memory size of 1024 words (0400h) would be returned in the following format:
Serial I/O, SNP & RTU Protocols
0100 = Halted
0110 = Stopped_IO_Enabled
Word Least Significant
SP Byte 18 19
Contains 00 04
7 6 5
0 0 0
Bit pattern same as SP(00)
Major 79 (in hexadecimal)
Minor 80 (in hexadecimal)
7 ASCII characters + termination character (00h)
Major (in BCD)
Minor (in BCD)
Major
Minor
00h
PACSystems 43 (hexadecimal)
00h
1—247 (decimal)
00h
%R size (words)
%AI size (words)
%AO size (words)
%I size (bits)
%O size (bits)
%M size (bits)
The amount of program memory occupied by the
logic program.
00h
0001 = Run_Disabled
Most Significant
1A 1B
00 00
Section 6
October 2019
Bits
4 3 2 1
0 See note. 78
0101 = Suspended
0
187