Rockwell Automation 1756-XXXX ControlLogix Analog I/O Modules User Manual

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Publication 1756-UM009C-EN-P - December 2010

Appendix C Use Ladder Logic To Perform Run Time Services and Reconfiguration

The following table contains input configuration information that is
necessary only

if you are configuring the message with RSLogix 5000

software, versions 9 or earlier.

Object Type

Class

Object that you are sending a message to, such
as the device object or a discrete output point.

Object ID

Instance

Each object can have multiple instances. For
example, a discrete output can have 16 points
or instances of where a message can be sent.
This specifies the instance.

Object Attribute

Attribute

Further identifies the exact address for the
message. An analog input can have multiple
alarms so this attribute acknowledges a
specific alarm and not the other alarms. If an
attribute is not specified (default to 0) the
Service applies to all attributes of the
Class/Instance.

Relationship of Message Configuration Parameters

RSLogix 5000
Versions 9
and earlier

RSLogix 5000
Versions 10
and later

Description

Analog Input Modules Configuration Dialog Window Information

Enter the following

To unlatch the

high high alarm

To unlatch the

high alarm

To unlatch the

low alarm

To unlatch the

low low alarm

To unlatch the

rate alarm

Service Code

Object Type

Object ID

(1)

(Channel Number)

1…6 or 1…8

Object Attribute

Number of Elements

0 bytes

(1)

The 1756-IF16 module does not have any unlatchable features in the 16-channel mode.

IMPORTANT

For input or output modules, the Object Attribute determines
which alarm feature for the selected channel to unlatch. If this
field is left blank, all alarms for the selected channel will
be unlatched.

You must send separate message instructions to control
specific alarms on each channel of the module.

Also, Object ID represents channel number. For the 1756-IF6I,
1756-IR6I, and 1756-IT6I modules, channels 0…5 are
represented by Object ID 1…6. For the 1756-IF16 (in differential
mode only) and 1756-IF8 modules, channels 0…7 are
represented by Object ID 1…8.