17.3 Single-pin interlock interface
Observe the following with single-pin interlock interface:
– The interlock interface is made through external plus switching contacts or
single-pin switching safety terminals.
– The 24 V supply of all solenoid coils must be on the same potential.
– 16 solenoid coils can be actuated through the interlock (V
n
+).
– The solenoid coils that do not require an interlock interface can be supplied
directly with 24 V from pin 1 … 3.
– Creation of the respective input voltage is reported as an image table through
the fieldbus.
Note
The interlock contacts V1– … V16– must not be used with the single-pin interlock
interface.
For an example of a circuit diagram for a single-pin interlock interface
Fig. 12.
17.4 Double-pin interlock interface
Observe the following with the double-pin interlock interface:
– The interlock interface is made through external plus-minus switching safety
terminals.
Note
Internal activation of valves 1 … 16 via the fieldbus must not be used.
Inadvertent actuation of the internal drivers of the VTUG-PT-L via the fieldbus
can be detected by most safe terminals. Only use terminals that detect inadvert-
ent actuation via the fieldbus.
– The solenoid coils of the interlock valves are controlled via the corresponding
pin in the Sub-D plug connector (pins 7 … 38).
– The solenoid coils that do not require an interlock interface can be supplied
directly with 24 V (e.g. from pin 1 … 3).
– A difference in potential between V
n
– and 0 V
VAL/OUT
is permissible only below
5 V.
– The test impulses (
≤
1 ms) used for error detection by safe output terminals are
suppressed by a special filter switch.
– The current consumption for each valve is below 20 mA on the VTUG-PT-L. Some
safe terminals detect a wire break if current consumption is below 20 mA. In
these cases, the wire break detection must be switched off.
For an example of a circuit diagram for a single-pin interlock interface
Fig. 13
0 V
VAL
V
16
–
24 V
VAL
V
1
–
V
1
+
V
16
+
1
2
3
4
5
6
7
8
9
1
Power supply V+; solenoid coil 33 … 48, (no interlock)
2
Power supply V+; solenoid coil 17 … 32, (no interlock)
3
Control Vn+ (via interlock)
4
Interlock contacts of the output terminal
5
I-port connection pin 2, 24 V
VAL/OUT
(PL), load voltage supply
6
I-port connection pin 5, 0 V
VAL/OUT
(PL),
7
Driver, controlled via fieldbus/I-port
8
Interlock Sub-D plug connector
9
Power supply (interlock)
Fig. 12
24 V
VAL
0 V
VAL
V
16
+
V
1
+
V
16–
V
1
–
V
2
–
V
2
+
aJ
9
8
7
6
5
4
3
2
1
1
Direct control V+; solenoid coil 33 … 48, (no interlock)
2
Direct control V+; solenoid coil 17 … 32, (no interlock)
3
Control Vn+ (via interlock)
4
Interlock contacts of the output terminal
5
Control Vn– (via interlock)
6
I-port connection pin 2, 24 V
VAL/OUT
(PL), load voltage supply
7
I-port connection pin 5, 0 V
VAL/OUT
(PL), load voltage supply
8
Driver, controlled via fieldbus/I-port
9
Interlock Sub-D plug connector
aJ
Power supply (interlock)
Fig. 13
