Of The Plc (Cpu Of The Dp Master And The Power Supply Voltage L + - Siemens SIMATIC ET 200S Manual

Influence of the Power Supply and the Operating State
The input and output values of the analog modules are dependent on the power
supply for electronics/sensors and on the operating state of the PLC (CPU of the
DP master).
Table 12-27 Dependence of the Input and Output Values on the Operating State of the PLC (CPU of the
DP Master) and the Power Supply Voltage L +
Operating State Power supply
of the PLC (CPU L + at ET 200S
of the DP Master) (power mod-
POWER RUN L + present
ON ON
L + missing
POWER STOP L + present
ON
L + missing
POWER -- L + present
OFF
L + missing
Influence of the Value Range on the Analog Input
The response of the electronics modules with analog inputs depends on the part of
the value range in which the input values are located. The following table 12-28
illustrates the relationship.
ET 200S Distributed I/O System
EWA-4NEB 780602402-12
Input Value of the Electronics
Module with Analog Inputs
(Evaluation Possible on the
ule) CPU of the DP Master)
Process values
7FFF until first conversion
H
after startup, or after
assignment of parameters for
the module is completed.
7FFF
H
Process value
7FFF
H
--
--
Analog Electronic Modules
Output Value of the Electron-
ics Module with Analog Out-
puts
PLC values
Until first value output:
•
After startup, a signal of 0 V
is output.
•
Dependent on the
parameter "CPU/ master
STOP"
--
Dependent on the parameter
"CPU/ master STOP"
--
Dependent on the parameter
"CPU/ master STOP"
--
12-27