Kendrion Kuhnke Automation GmbH
AO4 U/I
– 12-Bit
147
17 May 2021
Module Options
The following options are available for module AO4:
Variable
Data type Explanation
Channel_n_On
BOOL
Enables channel n.
(set to high impedance to disable)
Channel_n_Current
BOOL
Sets channel n to current output mode
Chan1_Unipolar
BOOL
Channels 0 & 1 or 2 & 3 in unipolar mode
Outputs_Active_Shortcut
BOOL
Leave outputs unchanged after short circuit
Outputs_Active_Undervoltage
BOOL
Leave outputs unchanged after low voltage
Outputs_Active_Specific_Error
BOOL
Leave outputs unchanged after module-specific
error (see 0)
Outputs_Active_EtherCAT_Error BOOL
Leave outputs unchanged after short circuit
n
0 … 3
Channel number
To set and accept options, see section Module
Module State
The following module states are indicated:
Variable
Data type Explanation
Shortcut
BOOL
Short circuit (not used)
Undervoltage
BOOL
Low voltage (supplied power < 19.2V)
Watchdog
BOOL
Internal watchdog of module
EtherCAT_Error
BOOL
Configuration error or watchdog control
Specific_Error
BOOL
Module-specific fault
OptionsSet
BOOL
Sent by module to acknowledge SetOptions
To reset the messages, see section Module
Module-specific Messages
Apart from the module state, there is a set of messages containing details about the current state of the
module:
Variable
Data type Explanation
Channel_n_Overtemp
BOOL
Short circuit in output driver of channel n, i.e. the
temperature is > 140 °C (automatic switch-off) (see
Module Options, Outputs_Active_Shortcut)
Undervoltage_24
BOOL
Less than 19.2 V supplied to the module (see
Module Options, Outputs_Active_Undervoltage)
Channel_n_Open
BOOL
Current mode: channel n load is gt 500
Specific_Error=TRUE
Channel_n_Shortcut
BOOL
Voltage mode: channel n load is lt 600
Specific_Error=TRUE
These messages are automatically reset when the state concerned has returned to normal.
Messages Channel_n_Open and Channel_n_Shortcut are combined into a single "Specific_Error" state of
the module and output to the IO LED as "module-specific error".
Conversion Time
The AO4 module's cycle time (time from importing the output values till starting the DA converters) is 320 µs,
irrespective of the number of active channels.