W.E.S.T. Elektronik PAM-199-P-PFN Guide

Technical Documentation
PAM-199-P-PFN
Universal power amplifier with ProfinetIO interface

Page 2 of 43 PAM-199-P-PFN 05.06.2020
Contents
1General Information......................................................................................................................................................4
1.1 Order Number.......................................................................................................................................................4
1.2 Scope of supply....................................................................................................................................................4
1.3 Accessories..........................................................................................................................................................4
1.4 Symbols used.......................................................................................................................................................5
1.5 Legal notice..........................................................................................................................................................5
1.6 Safety instructions................................................................................................................................................6
2Characteristics..............................................................................................................................................................7
2.1 Device description................................................................................................................................................8
3Use and application......................................................................................................................................................9
3.1 Installation instruction...........................................................................................................................................9
3.2 Typical system structure.....................................................................................................................................10
3.2.1 Function 195..............................................................................................................................................10
3.2.2 Function 196..............................................................................................................................................10
3.3 Method of operation............................................................................................................................................11
3.4 Commissioning...................................................................................................................................................11
4Function modes and technical description.................................................................................................................. 12
4.1 LED Indications standard (first section)..............................................................................................................12
4.2 LED indications fieldbus (second section)..........................................................................................................13
4.3 Input and output signals .....................................................................................................................................14
4.4 Circuit diagram ...................................................................................................................................................15
4.5 Typical wiring......................................................................................................................................................16
4.6 Technical data....................................................................................................................................................17
5Parameter................................................................................................................................................................... 18
5.1 Parameter list 195 ..............................................................................................................................................18
5.2 Parameter list 196 ..............................................................................................................................................19
5.3 Basic parameters................................................................................................................................................20
5.3.1 LG (Changing the language for the help texts)..........................................................................................20
5.3.2 MODE (Switching between parameter groups)..........................................................................................20
5.3.3 SENS (Failure monitoring).........................................................................................................................20
5.3.4 PASSFB (Password for fieldbus)...............................................................................................................21
5.3.5 FUNCTION (Choosing operation mode)....................................................................................................21
5.3.6 CCMODE (Activation of the characteristic linearization)............................................................................21
5.4 Input signal adaption ..........................................................................................................................................22
5.4.1 A (Ramp function)......................................................................................................................................22
5.5 Output signal adaption........................................................................................................................................23
5.5.1 CC (Characteristics linearization) ..............................................................................................................23
5.5.2 MIN (Overlap compensation).....................................................................................................................25
5.5.3 MAX (Output scaling).................................................................................................................................25
5.5.4 TRIGGER (Threshold value of MIN function).............................................................................................25
5.6 Parameters of the power stage...........................................................................................................................26
5.6.1 CURRENT (Nominal output current)..........................................................................................................26
5.6.2 DAMPL (Dither amplitude).........................................................................................................................26
5.6.3 DFREQ (Dither frequency).........................................................................................................................26
5.6.4 PWM (PWM frequency).............................................................................................................................27
5.6.5 ACC (Auto adaptation of the closed loop current controller)......................................................................27
5.6.6 PPWM (Solenoid current controller P gain) ...............................................................................................28
5.6.7 IPWM (Solenoid current controller I gain)..................................................................................................28
5.7 Process data (Monitoring) ..................................................................................................................................28
6Appendix .................................................................................................................................................................... 29

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6.1 Failure monitoring...............................................................................................................................................29
6.2 Troubleshooting..................................................................................................................................................29
6.3 Description of the command structure................................................................................................................30
6.4 Status information...............................................................................................................................................30
7PROFINET IO RT interface ........................................................................................................................................31
7.1 PROFINET IO function.......................................................................................................................................31
7.2 PROFINET address assignment.........................................................................................................................31
7.3 Device data file (GSDML)...................................................................................................................................31
7.4 IO Description.....................................................................................................................................................32
7.5 Commands via Profinet ......................................................................................................................................34
7.5.1 Overview....................................................................................................................................................34
7.5.2 Definition control word 1.............................................................................................................................35
7.5.3 Definition control word 2.............................................................................................................................36
7.6 Feedback via Profinet.........................................................................................................................................37
7.6.1 Overview....................................................................................................................................................37
7.6.2 Definition status word 1..............................................................................................................................38
7.6.3 Definition status word 2..............................................................................................................................39
7.7Parameterizing via Profibus................................................................................................................................40
7.7.1 Procedure ..................................................................................................................................................40
7.7.2 Parameter list mode 195............................................................................................................................41
7.7.3 Parameter list mode 196............................................................................................................................42
8Notes..........................................................................................................................................................................43

Page 4 of 43 PAM-199-P-PFN 05.06.2020
1 General Information
1.1 Order Number
PAM-199-P-PFN - universal power amplifier for directional valves or two pressure or throttle valves
with ProfinetIO interface
Alternative products
PAM-199-P-PDP - universal power amplifier for directional valves or two pressure or throttle valves
with ProfibusDP interface
PAM-199-P-ETC - universal power amplifier for directional valves or two pressure or throttle valves
with EtherCat interface
PAM-199-P - universal power amplifier for directional valves or two pressure or throttle valves
with analogue demand and digital inputs
1.2 Scope of supply
The scope of supply includes the module plus the terminal blocks which are a part of the housing.
The Profibus plug, interface cables and further parts which may be required should be ordered separately.
This documentation can be downloaded as a PDF file from www.w-e-st.de.
1.3 Accessories
WPC-300 - Start-Up-Tool (downloadable from our homepage –products/software)
Any standard cable with USB-A and USB-B connector can be used as the programming cable.

Page 5 of 43 PAM-199-P-PFN 05.06.2020
1.4 Symbols used
General information
Safety-related information
1.5 Legal notice
W.E.St. Elektronik GmbH
Gewerbering 31
D-41372 Niederkrüchten
Tel.: [phone]
Fax.: [phone]
Homepage: www.w-e-st.de
EMAIL: [e-mail]
Date: 05.06.2020
The data and characteristics described herein serve only to describe the product. The user is required to
evaluate this data and to check suitability for the particular application. General suitability cannot be inferred
from this document. We reserve the right to make technical modifications due to further development of the
product described in this manual. The technical information and dimensions are non-binding. No claims may
be made based on them.
This document is protected by copyright.

Page 6 of 43 PAM-199-P-PFN 05.06.2020
1.6 Safety instructions
Please read this document and the safety instructions carefully. This document will help to define the product
area of application and to put it into operation. Additional documents (WPC-300 for the start-up software) and
knowledge of the application should be taken into account or be available.
General regulations and laws (depending on the country: e.g. accident prevention and environmental protec-
tion) must be complied with.
These modules are designed for hydraulic applications in open or closed loop control circuits.
Uncontrolled movements can be caused by device defects (in the hydraulic module or the
components), application errors and electrical faults. Work on the drive or the electronics must
only be carried out whilst the equipment is switched off and not under pressure.
This handbook describes the functions and the electrical connections for this electronic as-
sembly. All technical documents which pertain to the system must be complied with when
commissioning.
This device may only be connected and put into operation by trained specialist staff. The in-
struction manual must be read with care. The installation instructions and the commissioning
instructions must be followed. Guarantee and liability claims are invalid if the instructions are
not complied with and/or in case of incorrect installation or inappropriate use.
CAUTION!
All electronic modules are manufactured to a high quality. Malfunctions due to the failure of
components cannot, however, be excluded. Despite extensive testing the same also applies
for the software. If these devices are deployed in safety-relevant applications, suitable external
measures must be taken to guarantee the necessary safety. The same applies for faults which
affect safety. No liability can be assumed for possible damage.
Further instructions
The module may only be operated in compliance with the national EMC regulations. It is
the user’s responsibility to adhere to these regulations.
The device is only intended for use in the commercial sector.
When not in use the module must be protected from the effects of the weather, contamina-
tion and mechanical damage.
The module may not be used in an explosive environment.
To ensure adequate cooling the ventilation slots must not be covered.
The device must be disposed of in accordance with national statutory provisions.

Page 7 of 43 PAM-199-P-PFN 05.06.2020
2 Characteristics
This module is used for the control of a directional valve with two solenoids or up to two (pressure or throttle)
valves with one solenoid. With the parameter FUNCTION the operation mode can be switched. Various ad-
justable parameters allow for an optimized adaptation to the respective valve. The integrated power amplifier
is an inexpensive and space-saving solution.
Controlling the amplifier is realized here via a ProfinetIO interface. Furthermore this provides changing most of
the parameters via the bus.
The output current is closed loop controlled and therefore independent from the power supply and the solenoid
resistance. The output stage is monitored for cable breakdown, is short circuit proof and disables the power
stage in case of an error.
RAMP, MIN and MAX, the DITHER (frequency and amplitude) and the PWM frequency are programmable.
In addition, the valve characteristics can be linearized via 10 XY-points. For example: using pressure valves a
linear behavior between input signal and pressure can be reached.
Typical applications: Control of directional, throttle and pressure valves, which need a flexible adaptation of
the solenoid control. All typical proportional valves of the different manufactures (BOSCH, REXROTH,
PARKER, EATON ...) can be controlled.
Features
Control of directional, pressure or throttle valves
Compact housing
Digital reproducible adjustments
Controlling via Profinet
Parameterization via Profinet
Characteristics linearization via 10 XY-points per direction
Free parameterization of RAMPS, MIN / MAX, PWM, output current and DITHER
Range of the rated output current up to 2.6 A
Simple and application orientated parameter settings via WPC-software
Failure monitoring and extended function check

Page 8 of 43 PAM-199-P-PFN 05.06.2020
2.1 Device description
1 2 3 4
5 6 7 8
910 11 12
14 15 1613
W.E.ST.
Ready A B
18 19 2017
22 23 2421
Error
LinkAct1
State
LinkAct2
V:
ID:
Add.:Date:
Made in Germany
D-41372Niederkrüchten
Homepage: http://www.w-e-st.de
W.E.ST.
Elektronik
Supply
45,0000 mm99,0000 mm
114,0000 mm
Typenschild und Anschlussbelegung
Type plate and terminal pin assignment
13 14 15 16
13 14 15 16
Klemmblöcke (steckbar)
Terminals (removable)
LEDs
USB
Interface
Feldbus / Fieldbus
Profinet
Feldbus Status Anzeigen
Fieldbus status display

Page 9 of 43 PAM-199-P-PFN 05.06.2020
3 Use and application
3.1 Installation instruction
This module is designed for installation in a shielded EMC housing (control cabinet). All cables which
lead outside must be screened; complete screening is required. It is also a requirement that no strong
electro-magnetic interference sources are installed nearby when using our open and closed loop con-
trol modules.
Typical installation location: 24V control signal area (close to PLC)
The devices must be arranged in the control cabinet so that the power section and the signal section
are separate from each other.
Experience shows that the installation space close to the PLC (24 V area) is most suitable. All digital
and analogue inputs and outputs are fitted with filters and surge protection in the device.
The module should be installed and wired in accordance with the documentation bearing in mind EMC
principles. If other consumers are operated with the same power supply, a star-connected ground wir-
ing scheme is recommended. The following points must be observed when wiring:
The signal cables must be laid separately from power cables.
Analogue signal cables must be screened.
All other cables must be screened if there are powerful interference sources (frequency
converters, power contactors) and cable lengths > 3m. Inexpensive SMD ferrites can be
used with high-frequency radiation.
The screening should be connected to PE (PE terminal) as close to the module as possi-
ble. The local requirements for screening must be taken into account in all cases. The
screening should be connected to at both ends. Equipotential bonding must be provided
where there are differences between the connected electrical components.
With longer lengths of cable (>10 m) the diameters and screening measures should be
checked by specialists (e.g. for possible interference, noise sources and voltage drop).
Particular care is required with cables of over 40 m in length –the manufacturer should be
consulted if necessary.
A low-resistance connection between PE and the mounting rail should be provided. Transient interfer-
ence is transmitted from the module directly to the mounting rail and from there to the local earth.
Power should be supplied by a regulated power supply unit (typically a PELV system complying with
IEC364-4-4, secure low voltage). The low internal resistance of regulated power supplies gives better
interference voltage dissipation, which improves the signal quality of high-resolution sensors in partic-
ular. Switched inductances (relays and valve coils connected to the same power supply) must always
be provided with appropriate overvoltage protection directly at the coil.

Page 10 of 43 PAM-199-P-PFN 05.06.2020
3.2 Typical system structure
3.2.1 Function 195
This minimal system consists of the following components:
(*1) proportional (directional) valve
(*2) hydraulic cylinder
(*3) PAM-199-P-PFN
(*4) interface to PLC with ProfinetIO and digital signals
3.2.2 Function 196
This minimal system consists of the following components:
(*1) proportional valve(s)
(*2) PAM-199-P-PFN
(*3) interface to PLC with ProfinetIO and digital signals

Page 11 of 43 PAM-199-P-PFN 05.06.2020
3.3 Method of operation
The command value for this power amplifier is transmitted via Profinet. The power stage and ramp function
are getting activated with an ENABLE signal. This signal consists of a hardware unlocking (digital input) and a
software unlocking (bit on Profinet). An error free operating is reported by a READY signal (digital output and
bit on Profinet). If the malfunction monitoring is active (SENS), the power stage and the READY signal will be
deactivated when a failure is detected. Depending on the setting of SENS the failure has to be erased by re-
setting ENABLE.
In mode 195 a command value of ±100% is affected. In case of a detected error the device gets deactivated.
In mode 196 two command values of 0… 100% are affected. Each channel has its own ENABLE bit on the
Profinet for using both channels independently from each other. If a solenoid error occurs only the defective
channel will be deactivated. The READY signal will be switched off because of this error, but the error free
second channel stays in operation.
3.4 Commissioning
Step
Task
Installation
Install the device in accordance with the circuit diagram. Ensure it is wired correctly
and that the signals are well shielded. The device must be installed in a protective
housing (control cabinet or similar).
Switching on for the first
time
Ensure that no unwanted movement is possible in the drive (e.g. switch off the
hydraulics). Connect an ammeter and check the current consumed by the device. If
it is higher than specified, there is an error in the wiring. Switch the device off imme-
diately and check the wiring.
Setting up communication
Once the power input is correct the PC (notebook) should be connected to the
serial interface. Please see the WPC-300 program documentation for how to set up
communication.
Further commissioning and diagnosis are supported by the operating software.
Now the fieldbus communication can be established. For the definition of the inter-
face the GSDML file has to be provided to the master.
Pre-parameterization
Now set up the following parameters (with reference to the system design and circuit
diagrams):
The nominal output CURRENT and the typical valve parameters such as PWM,
DITHER and MIN/MAX.
Pre-parameterization is necessary to minimize the risk of uncontrolled movements.
Control signal
Check the control signal with an amp meter. The control signal (the current of the
solenoid) is within the range of 0... 2, 6A. In the actual status it should show approxi-
mately 0 A.
ATTENTION! You can also monitor the solenoid current in the WPC-300 program or
at the fieldbus status.
Switching on the hydrau-
lics
The hydraulics can now be switched on. The module is not yet generating a signal.
Drives should be at a standstill or drift slightly (leave its position at a slow speed) if it
is a proportional valve.
Activating ENABLE
CAUTION! The drive can now leave its position and move to an end position with full
speed or the pressure can reach maximum. Take safety measures to prevent per-
sonal injury and damage.
Remote control mode
If the Profibus is not available at first commissioning of the system, the amplifier can
be controlled via the WPC program. For that the remote control mode In the monitor
view of the WPC program can be activated.
CAUTION! The WPC program will take the whole control over the device then. The
Enable signal at PIN 8 and the bus interface are inoperable in this case.

Page 12 of 43 PAM-199-P-PFN 05.06.2020
4 Function modes and technical description
4.1 LED Indications standard (first section)
LEDs
Description of the LED function application
GREEN
Identical to the READY output.
OFF: No power supply or ENABLE is not activated
ON: System is ready for operation
Flashing: Error detected (e.g. valve solenoid or 4… 20 mA).
Not active when SENS = OFF.
YELLOW A
OFF: Solenoid A is not controlled
ON: Solenoid A is active
YELLOW B
OFF: Solenoid B is not controlled
ON: Solenoid B is active
LEDs
Error messages
GREEN + YELLOW
1. Chasing light (over all LEDs): The bootloader is active. No normal functions
are possible.
2. All LEDs flash shortly every 6 s: An internal data error was detected and cor-
rected automatically! The module still works regularly. To acknowledge the error
the module has to be cycle powered.
YELLOW + YELLOW
Both yellow LEDs flash oppositely every 1 s: The nonvolatile stored parameters
are inconsistent! To acknowledge the error the data have to be saved with the SAVE
command or the corresponding button in the WPC.

Page 13 of 43 PAM-199-P-PFN 05.06.2020
4.2 LED indications fieldbus (second section)
LEDs
Description of the LED functionality (device)
GREEN
Supply:
OFF: No power supply for the fieldbus module.
ON: 3.3 V system voltage is available.
LEDs
Description of the LED functionality (fieldbus)
RED
Error:
OFF: No fieldbus error.
ON: Error at the fieldbus communication.
FLASHING: Participant flash test of the Profinet.
GREEN
State:
OFF: Bus not started yet.
ON: Connection established.
FLASH 2Hz: Configuration mode (bus was started, waiting for connection).
FLASH 10Hz: Error state.
GREEN
LinkAct1:
OFF: No connection at port 1.
ON (Pulse): Working network connected to port 1.
FLICKERING: Data traffic with network at port 1.
GREEN
LinkAct2:
OFF: No connection at port 2.
ON (Pulse): Working network connected to port 2.
FLICKERING: Data traffic with network at port 2.

Page 14 of 43 PAM-199-P-PFN 05.06.2020
4.3 Input and output signals
Connection
Supply
PIN 3
Power supply (see technical data)
PIN 4
0 V (GND) Power supply.
PIN 31
Power supply for the extension board.
PIN 32
0 V (GND) supply connection for the extension board.
Connection
PWM output
PIN 17 / 19
Current controlled PWM outputs for solenoid A.
PIN 18 / 20
Current controlled PWM outputs for solenoid B.
Connection
Digital inputs and outputs
PIN 8
ENABLE Input:
This digital input signal linked with the software enabling initializes the application and re-
leases the ramp function and power stage.
PIN 1
READY output:
ON: Module is ready, no errors are detected
OFF: ENABLE is deactivated or an error was detected.

Page 15 of 43 PAM-199-P-PFN 05.06.2020
4.4 Circuit diagram
PE via DIN-RAIL
17
19
20
1
8
Ready
Enable
digital output
USBType B
PAM-199-P-PFN
Valve
Adaption
digital input
u
Control program
Ramp
Function
Linearization
c
Power
stage
ia
ib
18
to solenoidA
to solenoid B
11
0 V
Power
supply
DC
DC
Demand
via
ProfiNet IO
3
4
w
wa, wb ca, cb ua, ub
+Ub
GND
22
24
ProfiNet
Gateway
Power
supply
Extension
card
ProfiNet IO 2 * RJ45
+Ub
GND

Page 16 of 43 PAM-199-P-PFN 05.06.2020
4.5 Typical wiring
Digital
outputs
Digital
inputs
8765
16151413
1211109
Shield
Power
supply 24V
0V
4321
PE terminal
Ready
232221
20191817
SolenoidA
Solenoid B
24
Enable
0 V (GND)
PE clamp
LinkAct 1
Profinet IO
LinkAct 2
Profinet IO
Shield

Page 17 of 43 PAM-199-P-PFN 05.06.2020
4.6 Technical data
Power supply (Ub)
Power consumption max.
External fuse
[VDC]
[W]
[A]
12… 30 (incl. ripple)
max. 2.5 + Power of the connected coils
3 medium time lag
Digital inputs
OFF
ON
Input resistance
[V]
[V]
[kOhm]
< 2
> 10
25
Digital outputs
OFF
ON
Maximum current
[V]
[V]
[mA]
< 2
max. Ub
50
PWM output
Max. output current
Frequency
[A]
[Hz]
Wire break and short circuit monitored
2.6
60… 2941 selectable in defined steps
Sample time
Solenoid current control
Signal processing
[µs]
[ms]
125
10
Profinet IO
Data rate
Conformance class
[Mbit/s]
-
100
CC-B
Serial interface
Transmission rate
-
[kBaud]
USB - virtual COM Port
9.6… 115.2
Housing
Material
Flammability class
-
-
Snap -on module acc. EN 50022
PA 6.6 polyamide
V0 (UL94)
Weight
[kg]
0.310
Protection class
Temperature range
Storage temperature
Humidity
[IP]
[°C]
[°C]
[%]
20
-20… 60
-20… 70
< 95 (non-condensing)
Connections
Communication
Ethernet
Plug connectors
PE
-
USB type B
RJ45
4-pole terminal blocks
via the DIN mounting rail
EMC
EN 61000-6-2: 8/2005
EN 61000-6-4: 6/2007 ; A1:2011

Page 18 of 43 PAM-199-P-PFN 05.06.2020
5 Parameter
5.1 Parameter list 195
Group
Command
Default
Unit
Description
Basic parameters
LG
EN
-
Changing language help texts
MODE
STD
-
Parameter view
SENS
AUTO
-
Malfunction monitor
PASSFB
0
-
Password for fieldbus parameterization
FUNCTION
195
-
Operation mode
CCMODE
OFF
-
Activation and deactivation of the characteristic linearization
Input signal adaptation
AA:1
AA:2
AA:3
AA:4
100
100
100
100
ms
ms
ms
ms
Command signal four quadrant ramp times
Output signal adaptation
CC
X Y
-
Free definable characteristic linearization
MIN:A
MIN:B
0
0
0.01 %
0.01 %
Deadband compensation
MAX:A
MAX:B
10000
10000
0.01 %
0.01 %
Output scaling
TRIGGER
200
0.01 %
Deadband compensation trigger point
SIGNAL:U
+
-
Changing output polarity
Parameters of the power stage
CURRENT
1000
mA
Rated solenoid current
DAMPL
500
0.01 %
Dither amplitude
DFREQ
121
Hz
Dither frequency
PWM
2352
Hz
PWM frequency
ACC
ON
-
Current loop auto adjustment
PPWM
IPWM
7
40
-
-
P-Gain of the current loop
I-Gain of the current loop

Page 19 of 43 PAM-199-P-PFN 05.06.2020
5.2 Parameter list 196
Group
Command
Default
Unit
Description
Basic parameters
LG
EN
-
Changing language help texts
MODE
STD
-
Parameter view
SENS
AUTO
-
Malfunction monitor
PASSFB
0
.
Password for fieldbus parameterization
FUNCTION
196
-
Operation mode
CCMODE
OFF
-
Activation and deactivation of the characteristic linearization
Input signal adaptation
AA:UP
AA:DWN
100
100
ms
ms
Command signal ramp times channel A
AB:UP
AB:DOWN
100
100
ms
ms
Command signal ramp times channel B
Output signal adaptation
CCA
CCB
X Y
X Y
-
-
Free definable characteristic linearization
MIN:A
MIN:B
0
0
0.01 %
0.01 %
Deadband compensation
MAX:A
MAX:B
10000
10000
0.01 %
0.01 %
Output scaling
TRIGGER
200
0.01 %
Deadband compensation trigger point
Parameters of the power stage
CURRENT:A
CURRENT:B
1000
1000
mA
mA
Rated solenoid current
DAMPL:A
DAMPL:B
500
500
0.01 %
0.01 %
Dither amplitude
DFREQ:A
DFREQ:B
121
121
Hz
Hz
Dither frequency
PWM:A
PWM:B
2352
2352
Hz
Hz
PWM frequency
ACC
ON
-
Current loop auto adjustment
PPWM:A
PPWM:B
7
7
-
-
P-Gain of the current loop
IPWM:A
IPWM:B
40
40
-
-
I-Gain of the current loop

Page 20 of 43 PAM-199-P-PFN 05.06.2020
5.3 Basic parameters
5.3.1 LG (Changing the language for the help texts)
Command
Parameters
Unit
Group
LG X
x= DE|EN
-
STD
Either German or English can be selected for the help texts in the WPC-300 program.
5.3.2 MODE (Switching between parameter groups)
Command
Parameters
Unit
Group
MODE X
x= STD|EXP
-
STD
This command changes the parameter mode. Various commands (defined via STD/EXP) are blanked out in
standard mode. The several commands in expert mode have more significant influence on the system perfor-
mance. Therefore they should be changed with care.
5.3.3 SENS (Failure monitoring)
Command
Parameters
Unit
Group
SENS X
x= ON|OFF|AUTO
-
STD
This command is used to activate/deactivate the monitoring functions (output current and internal failures) of
the module.
ON: All monitoring functions are active. Detected failures can be reset by deactivating the ENABLE input.
This mode should be used in case of active enabling and monitoring by a PLC (READY signal).
OFF: No monitoring function is active.
AUTO: Auto reset mode. All monitoring functions are active. If the failure does not exist anymore, the mod-
ule automatically resumes to work.
Normally the monitoring functions are always active because otherwise no errors are detectable via
the READY output. Deactivating is possible especially for troubleshooting.
AUTO MODE: The module checks each second the actual failure status, which will (in case of a per-
sistent error) trigger the LED and the READY output for a short time.