Rockwell Automation 1734-IK Encoder/Counter Modules User Manual - Manual (Page 40)

Publication 1734-UM006B-EN-P - August 2005
3-8 Input and Output Data
Safe State Values (Configuration Word 10)
When either the host transitions to PROGRAM mode or a
communication fault (broken network cable) occurs, the module
copies the safe state word (counter control value) into its real-time
working buffer. The definitions are identical to those described under
Real-time Output Data.
Communicate Real
Time/Nonreal Time
Information The Encoder/Counter Module uses several words to communicate real
time input and output data as well as non-real time module
information (such as description and revision) and configuration.
Assembly 101 is produced for a polled connection. Assembly 102 is
produced for a Change Of State (COS) connection. Assemblies 103,
104, and 106 are by Explicit message only. Assembly 105 is consumed
in a polled connection.
Data may be read (get) or written (set) using an Explicit Message. For
example, to read the Present Channel Data, assembly 101
10
(65
16
) can
be requested. The following table shows the words which can be
exchanged.
Instances Services Field Bytes
#101 (0x65) Get Present Channel Data 4
Status 2
#102 (0x66) Get Stored Channel Data 4
Status 2
#103 (0x67) Get Present Channel Data 4
Stored Channel Data 4
Status 2
#104 (0x68) Get Programming Error Code 2
#105 (0x69) Set/Get Counter Control 1
#106 (0x6a) Set/Get Counter Configuration 1
Filter Selection 1
Decimal Position 1
Reserved 1
Time Base 2
Gate Interval 1
Scalar 1
Rollover Value 4
Preset Value 4
Counter Control SSV 1