Download - Service, Support

Encoder signals and their evaluation
7.1 Types of encoders
The following table shows the encoder structure as it appears in the declaration table of the
application FB. This provides the status information and software controls of the encoder.
Table 7- 3
Address
Example Declaration Table for the Application FB, Encoder Structure
Declaration
Name
Type
Comment
Static section: This definition is position-specific. The encoder is a structure that has a fixed number of elements. The
names cannot be changed, but the size of Cur_Val and Load_Val must be set to INT or DINT according to which size of
encoder is configured.
38.0
stat
Encoders
STRUCT
Encoder structure. Do not change.
+0.0
stat
Direction
BOOL
Status: Direction
0 = up count, 1 = down count
+0.1
stat
Home
BOOL
Status: 1 = encoder is at home position.
+0.2
stat
Homed
BOOL
Status: 1 = Home was adopted since power up
+0.3
stat
Overflow
BOOL
Status: 1= overflow (displayed for the duration of one cycle)
+0.4
stat
Underflow
BOOL
Status: 1= Underflow (displayed for 1 cycle)
+0.5
stat
SSIFrame
BOOL
Status: SSI frame error or power loss
+0.6
stat
SSIDataRead BOOL
y
Status: 0 = SSI encoder has not yet shifted valid data, 1 =
data available
+0.7
stat
Open_Wire
BOOL
Status: 1 = Encoder has open wire
+1.0
stat
Hold
BOOL
Hold software input for incremental encoder
+1.1
stat
Reset
BOOL
Reset software input for incremental encoder
+1.2
stat
Load
BOOL
Load software input for incremental encoder
+2.0
stat
Cur_Val
DINT
Current value for incremental encoder: DINT for 32-bit
encoder, INT for 16-bit encoder
+6.0
stat
Load_Val
DINT
Load value for the encoder: DINT or INT
=10.0
stat
END_STRUCT
FM 352-5 high-speed Boolean processor
Operating Manual, 05/2011, A5E00131318-04
171