User manual

Chapter 6
PLC-5/VME Processor
Communications Commands
6-20
Use this command to set PLC-5/VME processor’s operating mode.
A no-privilege error is returned if the requester does not have the privilege
of placing the host in a download mode. This error occurs when:
the processor is not in Remote mode (must be in Remote Program
mode, Remote Run mode, or Remote Test mode)
the processor is being edited
some other node is already downloading to the processing
Bits 0 and 1 of the flag byte determine the operating mode of the
PLC-5/VME processor. To select the operating mode, set bits 1 and 0 in
flag byte “a.”
Mode Bit 01 Bit 00
Program Load (program scan idle, I/O scan disabled) 0 0
Remote Test (program scan enabled, I/O scan disabled) 0 1
Remote Run (program scan enabled, I/O scan enabled) 1 0
No change to Operating Mode (only remote bit affected) 1 1
Bit 02 Remote Lock. If set, this will attempt to lock out all other remote
devices from changing the CPU mode.
Bits 03-07 are not used (set to zero).
See the “Header Bit/Byte Descriptions” section on page 6-4 for all byte
descriptions.
Message Format
DST
00
PSN
00
SRC
00
PSN
00
CMD
0F
STS
00
TNS FNC
3A
Command Packet
Reply Packet
Flag
DST
00
PSN
00
SRC
00
PSN
00
CMD
4FH
STS TNS EXT
STS
Flag Byte
LNH
Hi
LNH
Lo
Unused
Lock Mode
Bit SelectByte
73210
Set CPU Mode