Plug Connectors; Counter And Gate Inputs; Counter & Gate Lnput Circuitry - Siemens 6ES5-424 Technical Reference Manual

Chapter 2
Module Setup Procedures
Plug Connector Block Diagram
2.8 Inputs And Outputs
2.8.1 Plug Connectors
The connection of the 6ES5 242 counter module to the user
inputs and outputs is accomplished via a %pin plug connector.
There are five such connectors mounted on the front plate
of the module, one for each of the five counters. (See
Figures 2-1 and 2-2)
9. Counter
Ext
Volt. (-)
[
fji
i
5.
Gate Input
(-)
I
Plug
n
Pin Signal Description
Externally
Supplied DC
Voltage
8
Counter
Outp~t Signal
4.
Gate Input Signal
I
Indicates Connection for Common
Ground
I
1 Shield Cable shield connection
2 lNxM Counter Input
X,
M terminal (minus)
7.NOtCiXmCkd 6 3. Counter Input Signal
3 INx Counter Input
X,
signal
4 Tx
6. Counter
Ext.
Vol t .
(+)
Gate Input
X,
signal
0
2. Counter Input (-)
5 TxM Gate Input
X,
M terminal (minus
6 AxP
1. Shield
Counter Output
X,
external voltage
7 not connected
8 Ax Counter Output
X,
signal
9 AxM Counter Output
X,
external voltage (minus)
NOTE:x= 1 - 5
Figure 2-2 242 Module Plug Connector Pinot
figure 2-1 242 Module Plug Connector Block Diagram
Plug Connector Pinout
Connector
2.8.2 Counter and Gate Inputs
The counter and gate inputs which are connected through
the front connectors of the module are galvanically isolated
by means of optocouplers. The input circuitry is identical for
both types of inputs and can be configured for TTL levels or
24 vdc levels.
The counter inputs are pulse edge sensitive. The gate inputs
can be programmed in the counter mode (CM) register to be
either pulse edge sensitive or level sensitive.
Figure 2-3 illustrates the circuitry of the counter input gates.
The circuit is supplied with an input resistor (Rx) to allow
different input voltage levels to be selected. A capacitor
(W)
can be added to the output to suppress noise spikes. Note
that the counting frequency is affected when capacitors are
added.
*
lNX
T-f-q
l NxM
Figure 2 3 Counter & Gate lnput Circuitry