Ssi Encoder Signals - Siemens SIMATIC S7-1500 Manual

Wiring

3.1 SSI encoder signals

3.1 SSI encoder signals
SSI encoder signals
The TM PosInput 2 can process SSI encoder signals. These are designated with data and
clock and use the RS422 signal standard.
An RS422 encoder signal uses a pair of wires and the information is transmitted as
differential voltage. This ensures interference-free transmission of RS422 encoder signals
even with high frequencies over long distances. The RS422 wire pairs must be twisted
together in the cable.
The SSI encoder signals data and clock are connected via the D and C terminals. The N
terminals remain unconnected. The inputs are not isolated from each other. The inputs are
isolated from the backplane bus.
Pin assignment for the front connector
The table below shows the pin assignment of the front connector.
Table 3- 1 Pin assignment of the front connector
Designation
Channel 0
SSI data signal +D
SSI data signal -D
SSI clock signal +C
SSI clock signal -C
—
—
Encoder supply 5 V DC
Ground for encoder sup-
plies and digital inputs
Encoder supply 24 V DC
Ground for encoder sup-
plies and digital inputs
Digital input DI0
Digital input DI1
—
—
Digital output DQ0
Digital output DQ1
—
Digital output ground
—
Note
Potential jumpers may not be inserted in the front connector.
22
Signal name
+CH0.A/D 1
-CH0.A/D 2
+CH0.B/C 3
-CH0.B/C 4
+CH0.N 5
-CH0.N 6
5VDC 7
M 8
24VDC 9
M 10
DI0.0 11
DI0.1 12
— 13
— 14
DQ0.0 15
DQ0.1 16
— 17
M 18
— 19 - 20
View Signal name
Channel 1
21 +CH1.A/D
22 -CH1.A/D
23 +CH1.B/C
24 -CH1.B/C
25 +CH1.N
26 -CH1.N
27 5VDC
28 M
29 24VDC
30 M
31 DI1.0
32 DI1.1
33 —
34 —
35 DQ1.0
36 DQ1.1
37 —
38 M
39 - 40 —
Technology module TM PosInput 2 (6ES7551-1AB00-0AB0)
Designation
SSI data signal +D
SSI data signal -D
SSI clock signal +C
SSI clock signal -C
—
—
Encoder supply 5 V DC
Ground for encoder
supplies and digital
inputs
Encoder supply 24 V DC
Ground for encoder
supplies and digital
inputs
Digital input DI0
Digital input DI1
—
—
Digital output DQ0
Digital output DQ1
—
Digital output ground
—
Manual, 06/2018, A5E03982218-AB