Manual
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  Page 5 | ENG
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Screw terminal
 6: 
Common GND connection 
for all inputs
Screw terminal
 7: 
(–) external power supply for the backlight option
Screw terminal
 8: 
(+) external power supply for the backlight option
(24 V DC ±20 %, 50 mA), Fuse T0.08 A, delayed action
All low voltages, SELV, reinforced/double 
insulation.
 Signal inputs must be protected with an exter-
nal delayed T0.01 A fuse when the source 
does not provide protective impedance (fuse/
current limitation).
Screw terminal 1: 
Timer Enable Input:   time measurement as long as 
the level at this input is high.
Optocoupler input  10…260 V AC/DC
  galvanic isolation, active for  
  High signal
Low level:  0…2 V AC/V DC
High level:  10…260 V AC/DC
Input resistance:  approximately 160 kOhm
AC mains frequency:  50/60Hz
Screw terminal 2: 
Common AC/DC, common connection for the optocoup-
ler inputs (screw terminals 1 and 3)
Screw terminal 3:
Reset input:  active for high level.
Optocoupler input:  10…260 V AC/DC galvanic
  isolation, active for high signal
Min. pulse duration:  16 ms
Max. frequency:  approximately 30 Hz
Low level:  0…2 V AC/V DC
High level:  10…260 V AC/DC
Input resistance:  approximately 160 kOhm
AC mains frequency:  50/60Hz
Screw terminal
 4: 
Electrical locking of the reset key
Contact input / Open Collector NPN 
(switching at 0 V DC)
Low level:  0…0.7 V DC
High level:  3…5 V DC
Input resistance:
approximately
 2.2 MOhm
Input not active:  Reset key locked
Input in contact with GND:
  Reset key unlocked
Screw terminal 5:
Time range switching (Mode)
Contact input / Open Collector NPN  
(switching at 0 V DC)
Low level:  0…0.7 V DC
High level:  3…5 V DC
Input resistance:  approximately 2.2 MOhm
Function:  see table 3
Note: 
If the time range is changed during operati-
on,
 the device must be reset, otherwise the 
counting value will not be reproducible. 
!
DANGER
Input specification, terminal assignment and adjustable time ranges (AC versions)
The time range is set via a control input (screw terminal 5).
Screw terminal No. 1 No. 2 No. 3 No. 4 No. 5 No. 6 No. 7 No. 8
Designation
Model
INP A 
AC/DC
Common 
AD/DC
INP B 
AC/DC
Reset 
Enable
Time range (Mode) GND BL 
–
BL 
+
6.134.012.8x3
Timer Enable Input AC/DC
Common connection for 
INP A and INP B
Reset input AC/DC
NPN reset key locking input, 
Contact with GND. Key free.
not active
= 
99999 h 59 m
contact with 
GND
=
99999,99 h
GND = 0 V DC
Backlighting (–)
Backlighting (+)
6.135.012.8x3
not active 
= 
9999 h 59 m 
59 s
contact with 
GND 
= 
9999999,9 s
Table 3
t










