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

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