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Rockwell Automation 2706-ND1 DL40 OFFLINE PROGRAMMING SFTWR.USER MANUAL User Manual

Page 21

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Chapter 2
Introduction to the DL40

2 – 10

Table 2.C
Summary of Remote I/O Run Mode Types

Feature

Message/Variable/Slave

Run Mode

Message/Variable Run

Mode

Message List Run Mode

Bit Trigger Run Mode

Trigger messages

Trigger a message with 1 to 40 variables, depending on rack
size, trigger method, and variable type

Triggers a message list of
up to 20 messages in
Round Robin Order

Triggers a Priority Message
and up to 496 messages in
Priority and/or Round Robin
Order

Triggering method

D

1

/

4

rack – Block Transfer

only

D

1

/

2

,

3

/

4

, full rack – Discrete

I/O or Block Transfer

D Keyboard

D RS-485 link

D Discrete I/O or Block Transfer

D Keyboard Port

D RS-485 link

D Discrete I/O or Block

Transfer

D Keyboard (for Priority

Message only)

D RS-485 link (for Priority

Message only)

Send messages to slave
display

Slave address for each
message can be specified
with message trigger.
(Overrides address
specified as Message
Attribute)

Slave address specified as a Message Attribute

Send variables to place in
message

D Up to 10 (16 bit) binary or (4 digit) BCD

D Up to 20 (8 bit) ASCII

D Up to 40 (4 bit) BCD

No

Variable types

Binary – Signed and Unsigned BCD
ASCII

Not Applicable

Handshaking

Yes

Diagnostic code sent to PLC

Yes

Message acknowledgement

Yes

Input and display of ASCII
input data (via keyboard
port)

Up to 20 ASCII characters

Return ASCII input data to
PLC via Remote I/O port

D Discrete I/O – Up to 12 characters, depending on rack size

D Block Transfer – Up to 20 characters, independent of rack size

No

Return ASCII input data via
RS-485 port

Up to 20 characters, independent of rack size

Put message on Historical
Events Stack

Yes