Ssi Encoder Block - Mitsubishi Electric MELSEC iQ-R User Manual

SSI encoder block

Outline
In the second section in the hardware logic outline window, two SSI encoder blocks ("SSI_Encoder_") can be arranged.
The SSI encoder blocks perform serial communication with the absolute encoder having the SSI (Synchronous Serial
Interface) output and acquire position data. The acquired position data is stored as a count value of the multi function counter
block linked to this block.
• When "Signal Error Detection" is set to "Enable", a signal error detection processing is performed. If an error occurs on the
external wiring to the SSI encoder, the SSI encoder block  DATA signal wire reverse error (error code: 109H) or the SSI
encoder block  DATA signal error (error code: 10AH) is output.
• When "Parity" of "Data Frame Setting" is set to "Even" or "Odd", a parity check is performed. If an error is detected by the
parity check, the SSI encoder block  parity error (error code: 10BH) is output.
• If any of the above errors (error code: 109H to 10BH) is output during data receipt from the absolute encoder, the count
value of the multi function counter block linked to this block does not change. The position data is reflected to the count
value when data has been received properly at next transmission.
Input
The following table shows the input of the SSI encoder block.
Variable name Data type
Data Bit
Linkable block
External input
Valid range Description
0, 1 Inputs data from the SSI encoder.
3 CREATING A HARDWARE LOGIC
3.1 Main Blocks in the Hardware Logic Outline Window
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