Expansion Of Basic Unit With Failsafe Digital Input Module; Expansion Of Basic Unit With Failsafe Digital Output Module - Siemens SIMATIC S5-95F Manual

S5-95F
5.5.1

Expansion of Basic Unit with Failsafe Digital Input Module

When you use the digital input module 431-8FA.. for safety-related tasks, you must always use it in
a redundant configuration (in pairs) - one module in subunit A and one module in subunit B. Eight
galvanically isolated DI channels are available for each pair of modules.
Example: Connection of Single-Channel, Failsafe Sensors (Type B)
Insert one module into slot n of subunit A and the other module into slot n+1 of subunit B, with
n being an even number between 0 and 30 (see section 6.1).
Connect the 24 V DC supply voltage to terminals 1 and 2.
Wire the inputs with the sensors (as shown in Figure 5-12).
Parameterize the inputs in DB1.
1
L+
2
M
4
.0
3
.1
6
.2
5
.3
8
.4
7
.5
10
.6
9
.7
8
DIGITAL INPUT
8 x 24 V DC
6ES5 431-8FA11
1 3 5 7
2 4 6 8
I x.0
L+
M
Figure 5-12. Example for Connection of Single-Channel, Failsafe Sensors to
EWA 4NEB 812 6210-02
9
10
I x.7
an External Digital Input Module
Expansion of Basic System with External I/Os
1
L+
2
M
4
.0
3
.1
6
.2
5
.3
8
.4
7
.5
10
.6
9
.7
8
DIGITAL INPUT
8 x 24 V DC
6ES5 431-8FA11
1 3 5 7
2 4 6
9
8 10
5-13