User manual

Chapter 6
PLC-5/VME Processor
Communications Commands
6-27
Error Codes
The STS byte contains 00H if no error. When detected, the PLC-5/VME
processor reports errors in its reply packet as follows:
STS EXT STS Description
00H – No error
10H – Incorrect command format
40H – Internal error such as a parity error
F0H
03H Incorrect address
07H Segment exceeds the end of user memory
0AH Transaction size too large for a packet
0BH Access denied
12H Invalid packet format
Refer to page D-3 for additional information on PCCC status codes.
Sample API Module
For a sample
interface
header file:
Refer to page: For a sample
implementation
source file:
Refer to page:
P40VRBP.H B-69 P40VRBP.C B-70
Use this command to download PLC-5/VME processor memory after a
successful download-all-requests command. You can download up to 119
words (238 bytes) per packet. Words are loaded low byte first. The first
byte and the number of bytes written must be an even number.
You download PLC-5/VME processor memory using successive write
bytes physical commands for each of three memory segments. The
memory segments are defined by start and end pointers returned by the
upload all requests command. The first command starts at the physical
address defined by a memory segment pointer. You must increment the
physical address of successive commands. You increment the current
physical address over the previous physical address by the same number of
bytes (equal to the SIZE value) each command until the segment is
complete. The packet size of the last command may be less.
See the “Header Bit/Byte Descriptions” section on page 6-4 for a
description of each byte.
Write Bytes Physical