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Counter Outputs; Signal Conditioning; Counter & Gate Lnput Ttl Level Circuitry - Siemens 6ES5-424 Technical Reference Manual

Counter module.
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Chapter 2
Module Setup Procedures
TTL Level Specifications
The input circuit for l T L levels should be designed to provide
a +5 vdc at INx continously, and provide an open collector
configured circuit at the lNxM input, which does the switching.
This circuit configuration is show in Figure 2-4.
Figure 2-4 Counter & Gate lnput TTL Level Circuitry
Description
Value
Notes
INx
4.75
-
5.25 Vdc
lNxM
0.5
-.
0.8 Vdc
Low Level
lNxM
l ma leakage
High Level
current
lnput current
approx. -6.5 ma
lNxM = 0.4 V, INx
=
5 V
lnput Resistance
approx. 500 ohm
Rx
Jumper
24 Vdc Level Specifications
Figure 2-5 illustrates the necessary configuration for 24 V input
to the gate input circuitry
Figure 2-5 Counter & Gate. lnput 24
V
Level Circuitry
Description
Value
Notes
lNxM
0.0 v
INx
13
-
33 Vdc
High Level
INx
3 5
-
+4.5 Vdc
Low Level
lnput Current
approx. 12 ma
lNxM = O V , INx= 24 Vdc
lnput Resistance
approx. 2 k ohm
Rx
1,5 k ohm
2.8.3 Counter Outputs
The output of each of the five counters is routed to the plug
connectors on the front of the module. These outputs are
galvanically isolated by means of optocouplers. The outputs
are the equivalent of P switches and are current limited.
Driving distance is a function of the external voltage source
and, of course, the type of wire used. Distances of 200 meters
and beyond are attainable. Figure 2-6 illustrates the counter
output circuitry configuration.
Figure 2-6 Counter Output Circuitry
Description
Ax High Level
Ax Low Level
Short Circuit
AxP
Switching Freq
Delay Times
Low to High
High to Low
Rise Time
Fall Time
Value
22v
200 ma
20
-
30V
lOkHz
20 usec
20 usec
1 usec
5 usec
Notes
Residual voltage approx. 2V
Output Current = -100 ma
Resident current
=
-100 ua
AxP = 24V, AxM
=
O V , Rext
=
0
External supply voltage
Rext
=
330 ohm
Rext = 330 ohm
Rext = 330 ohm
Re*
=
330 ohm
Rext
=
330 ohm
NOTE: Rext
=
external load resistance
2.8.4 Signal Conditioning
The Cx and Rx.numbers for each of the counters and gates
are listed below.
CounterIGate
Counter Cx Rx
Gate Cx Rx
1
C15 R21
C22 R26
2
C1 6 R22
C23 R27
3
C1 7 R23
C24 R28
4
C18 R24
C25 R29
5
C1 9 R25
C26 R30
The values for Cx and the maximum counting frequency are
listed below.
Maximum
Counting Freq.
Cx value
approx
2000 kHz
no capacitor installed
approx
200 kHz
100 pf
approx
20 kHz
1 nf
approx
2 kHz
10 nf

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