HIMatrix 5 Inputs
HI 800 023 E Rev. 1.01 Page 27 of 72
5.2 Safety of Sensors, Encoders and Transmitters
In safety-related applications, the controller and its connected sensors, encoders and
transmitters must all meet the safety requirements and achieve the specified SIL. For more
on this, see the Annex
Increasing the SIL of Sensors and Actuators.
5.3 Safety-Related Digital Inputs
The described properties apply to both digital input channels of F60 modules and digital
input channels of all compact systems (unless stated otherwise).
5.3.1 General
The digital inputs are read once per cycle and saved internally; cyclic tests are performed to
ensure their safe functioning.
Input signals that are present for a time shorter than the time between two samplings, i.e.,
shorter than a cycle time, may not be detected.
5.3.2 Test Routines
The online test routines check whether the input channels are able to forward both signal
levels (low and high), regardless of the signals actually present on the input. This function
test is performed each time the input signals are read.
5.3.3 Reaction in the Event of a Fault
If the test routines for digital inputs detect a fault, the user program processes a low level
for the defective channel in accordance with the de-energize to trip mode
In addition to the channel signal value, the user program must also consider the
corresponding error code.
A compact system activates the ERROR LED, a F60 module the ERR LED.
The error code allows the user to monitor the external wiring and program additional fault
reactions in the user program.
Version Access to the error code Error code name
Versions
beyond
7
In the ...Channels tab located in the
detail view of the module or device
->Error code [bytes] in the row with the
channel number
Versions
prior to 7
In the Signal Connections... window of
the module or device
DI[xx].error code, xx = channel num-
ber
Table 14: Error Codes with Digital Inputs
5.3.4 Surges on Digital Inputs
Due to the short cycle time of the HIMatrix systems, a surge pulse as described in
EN 61000-4-5 can be read in to the digital inputs as a short-term high level.
The following measures ensure proper operation in environments where surges may occur:
1. Install shielded input wires
2. Activate noise blanking: a signal must be present for at least two cycles before it is
evaluated.
To Next Page
Loading...
Need help?
General
