Owner manual

Publication 1747-6.1
Chapter
8
Message Capability
This chapter provides:
• an overview of the message types
• programming parameters for the MSG instruction
• control block configuration for the 5/02 and 5/03 MSG
instructions
• operational descriptions of the message types
• sample SLC 5/02 user programs
Message Overview The module supports six types of messages. The table below
describes the functions of each:
Other module message capabilities are:
• display Write messages from any DH485 network device with
message capability
• display messages in the Monitor or Modify modes
• enter data in the Monitor or Modify modes
• message overwrite protection
Message Type Functions
8-Word
16 characters
Displayed on one line
Display-only
16-Word
32 characters
Displayed on two lines
Display-only
12-Word
16 characters
Operator reply
Initial value of zero
13-Word
16 characters
Operator reply
User-defined initial value
18-Word
16 characters
Operator reply
User-defined initial value
User-defined acknowledge bit addresses
1-Word
Clear message
Important: SLC 500 Fixed and SLC 5/01 Modular Controllers do
not support message capability.