Siemens SIMATIC ET 200SP - Page 177

Using the module
5.1 Using the technology module
Counting, measurement and position detection
176 Function Manual, 12/2017, A5E32009889-AG
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
Meaning
None
1
No external reference signal is used.
DI0
(preset for TM Count and TM PosInput)
The current counter value is saved as the new
encoder position reference mark upon a positive
edge at digital input DI0.
Signal N of incremental encoder
(default for Compact CPU
2
)
The current counter value is saved as the new
encoder position reference mark upon a positive
edge of the signal N of incremental encoder.
1
Only available with Compact CPU
2
Exceptions: "DI0" is the default for HSC 3 and HSC 6 on the 1511C as well as on the 1512C in
compatibility mode