Siemens SIMATIC ST-1500 Function Manual page 177

Using the module
5.1 Using the technology module
Module parameters for SSI absolute encoders
If you use an TM PosInput with an SSI absolute encoder, you need to configure the following
parameters for the encoder signals of the channel.
● Signal type
● Invert direction
● Frame length
● Code type
● Transmission rate
● Monoflop time
● Parity
● Bit number LSB of the position value
● Bit number MSB of the position value
● Steps per revolution and
● Reference speed
You can find additional information on the first new parameters in section SSI absolute
encoder (Page 142).
Signal selection for reference mark 0
You can use this parameter to specify the external reference signal upon which a new
reference mark is saved for the encoder position.
You can select from the following options:
Option
None
DI0
(preset for TM Count and TM PosInput)
Signal N of incremental encoder
(default for Compact CPU
Only available with Compact CPU
1
Exceptions: "DI0" is the default for HSC 3 and HSC 6 on the 1511C as well as on the 1512C in
2
compatibility mode
176
1
)
2
Meaning
No external reference signal is used.
The current counter value is saved as the new
encoder position reference mark upon a positive
edge at digital input DI0.
The current counter value is saved as the new
encoder position reference mark upon a positive
edge of the signal N of incremental encoder.
Counting, measurement and position detection
Function Manual, 12/2017, A5E32009889-AG