Specifications

Appendix Process Images
A - 12
MITSUBISHI ELECTRIC
A.1.6 Encoder module STL-ENC (ID number 51205116)
Using the encoder module STL-ENC, a 6 byte input and output process image can be transferred to the
head station via two logical channels.
The set values are stored in four output bytes (D0 to D3) and the process data are stored in four input
bytes (D0 to D3). Two control bytes (C0, C1) and two status bytes (S0, S1) are used to select process
data and set values as well as to control the data flow.
The process data is determined by the bits 0 and 1 in the control byte C1:
● Counter value
● Latch value
● Velocity
● Set value
The setting is mirrored in status byte S1 in bit 0 and bit 1.
Input data Output data
S0 Status byte S0 C0 Control byte C0
D0 Process data, byte 0 (LSB) D0 Set value, byte 0 (LSB)
D1 Process data, byte 1 D1 Set value, byte 1
S1 Status byte S1 C1 Control byte C1
D2 Process data, byte 2 D2 Set value, byte 2
D3 Process data, byte 3 (MSB) D3 Set value, byte 3 (MSB)
Tab. A-11: Input and output bytes of the STL-ENC
NOTE The representation of the process data of some I/O modules in the process image depends on the
fieldbus head station used.
Please take this information as well as the particular design of the respective control/status bytes
included in the description concerning the process image of the corresponding head station.
MapPZD (Control Byte C1 / Status Byte S1, bits 0 and 1)
Tab. A-12: Meaning of the bits 1 and 0 in C1/S1
Bit 1 Bit 0 Coding of the process data
00Counter value
01Latch value
1 0 Velocity (increments per milliseconds)
1 1 Set value