Parallel Message System (Status Messages); Number Of Bytes For Status Messages; Image Of The Status Messages - Omron NT4S Operation Manual

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4.9.2.4

Parallel Message System (Status Messages)

4.9.2.4.1

Number of Bytes for Status Messages

4.9.2.4.2

Image of the Status Messages

154
The parallel message system complements the serial message system. The mess-
ages are transmitted in parallel and are evaluated in the terminal. During this proc-
ess, the current message status is compared with the prior status in the terminal.
These messages are automatically deleted from the memory once they are no
longer pending. New messages are added to the memory. The current status of the
messages can be output.
Date and time are included in every message to indicate the point of time at which a
message has been generated.
The message buffer length is limited to a maximum of 256 bytes.
The length is to be set in the system parameters for the message system. There
may be restrictions regarding the length depending on the protocol.
Status messages are retained in the message memory only as long as they are
being reported by the controller.
Status messages can be transferred on a time or event controlled basis.
This parameter specifies the number of bytes to be transferred with the parallel
message system. The size depends on the number of status messages. The abso-
lute size also depends on the defined data type (address). For example, if a word
address has been defined and the number of bytes is odd, then this number will
automatically be rounded up.
For status messages, the starting address of the storage area containing the mess-
age information is entered here. The symbolic name is assigned to a fixed address.
The assignment of message number to bit information depends on the data type of
the controller variable. The data type has been processed in a protocol-specific
manner since the structures of byte, word and Lword are not identical in the sup-
ported controllers. It is important that once an assignment method is chosen, it is
not changed!
Byte-oriented assignment:
Byte address + 0
Byte address + 1
Byte address + 2
Byte address + 3
:
Byte address + n
Bit 7 Bit 6 Bit 5 Bit 4
Bit 7 Bit 6 Bit 5 Bit 4
Bit 7 Bit 6 Bit 5 Bit 4
Bit 7 Bit 6 Bit 5 Bit 4
:
Bit 7 Bit 6 Bit 5 Bit 4
Message 1 = Byte 0, Bit 0
Message 2 = Byte 0, Bit 1
Message 3 = Byte 0, Bit 2
:
Message 8 = Byte 0, Bit 7
Message 9 = Byte 1, Bit 0
Message 10 = Byte 1, Bit 1
Section 4-9
Bit 3 Bit 2 Bit 1 Bit 0
Bit 3 Bit 2 Bit 1 Bit 0
Bit 3 Bit 2 Bit 1 Bit 0
Bit 3 Bit 2 Bit 1 Bit 0
Bit 3 Bit 2 Bit 1 Bit 0