Use and Description of DDT for Explicit Exchange
Original instructions
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Introduction
The following table shows the Derived Data Type (DDT) used for the variables connected to dedicated EFB parameter to perform an explicit exchange:.
DDT
Description
T_M_COM_ASI_CH_STS
Structure to read the channel status
The DDT can be connected to the STS output parameter of the EFB READ_STS_MX.
T_M_COM_ASI_CH_CMD
Structure to send a command to the module
The DDT can be connected to the CMD input parameter of the EFB WRITE_CMD_MX.
T_M_COM_ASI_CH_PRM
Structure for adjustment parameters (1) of a channel.
The DDT can be connected to the PARAM output parameter of the EFB: 
(1)
Parameter management is only possible for explicit exchange with I/O modules in M580 local rack.
NOTE: Targeted channel address (ADDR) can be managed with ADDMX EF (connect the output parameter OUT to the input parameter ADDR of the communication functions).
T_M_COM_ASI_CH_STS Description
Name
Type
Bit
Meaning
Access
CH_FLT
INT
Channel faults
read
SLAVE_FLT
BOOL
1
detected error in one or more devices
APF_PIC_FLT
BOOL
2
APF Line detected error or PIC fault
ASI_CONF_FLT
BOOL
3
physical configuration different from software configuration
INTERNAL_FLT
BOOL
4
detected internal error or channel self-testing.
CONF_FLT
BOOL
5
detected hardware or software configuration error.
COM_FLT
BOOL
6
problem communicating with the PLC
APPLI_FLT
BOOL
7
detected error in application (adjustment or configuration)
EX_CONTROL_FLAGS
INT
execution control flags
read
CONFIG_OK
BOOL
0
correct configuration
SLAVE_0_PRESENT
BOOL
1
slave 0 present on the bus
AUTO_ADDRESS_ASSIGN
BOOL
2
automatic addressing
AUTO_ADDRESS_AVAILABLE
BOOL
3
automatic addressing authorized
CONFIGURATION_ACTIVE
BOOL
4
operation in AS-interface configuration mode
NORMAL_OPERATION_ACTIVE
BOOL
5
operation in normal mode
ASI_SUPPLY_FLT
BOOL
6
detected AS-interface power supply error
OFFLINE_MODE_ACTIVE
BOOL
7
offline mode active
DATA_EXCHANGE_OFF
BOOL
8
data exchenge inactive
PERIPH_FAULT
BOOL
9
detected peripheral error on a bus device
LDS_0A_15A
INT
list of detected slaves from 0 to 15 of bank A (1 bit per slave)
read
LDS_16A_31A
INT
list of detected slaves from 16 to 31 of bank A (1 bit per slave)
read
LDS_0B_15B
INT
list of detected slaves from 0 to 15 of bank B (1 bit per slave)
read
LDS_16B_31B
INT
list of detected slaves from 16 to 31 of bank B (1 bit per slave)
read
BANKA
ARRAY [0..31] of T_M_COM_ASI_CDI
actual configuration of the slaves of bank A)
read
BANKB
ARRAY [0..31] of T_M_COM_ASI_CDI
actual configuration of the slaves of bank B)
read
LAST_PARAM_SLAVE_VALUE
INT
contains the value of parameters of the last parameterized slave
read
LAST_PARAM_SLAVE_ADR
INT
contains the address of the last parameterized slave
read
T_M_COM_ASI_CDI Description
Name
Type
Bit
Meaning
Access
CDI
INT
–
actual configured profile of slave
  • bit 0 to 3 = configuration code for input/output channels (IO)
  • bit 4 to 7 = identification code (ID)
  • bit 8 to 11 = identification code (ID1)
  • bit 12 to 15 = identification code (ID2)
read
T_M_COM_ASI_CH_CMD Description
This DDT object is used to manage operating modes of the AS-Interface Bus master via WRITE_CMD_MX.
NOTE: Use of this object requires a thorough knowledge of AS-Interface communication principles.
Name
Type
Bit
Meaning
Access
HI_FLAGS
INT
Host Interface Flags
read/write
ENTER_OFFLINE
BOOL
0
switch to offline mode
LEAVE_OFFLINE
BOOL
1
exit from offline mode
DATA_EXCHANGE_INACTIVE
BOOL
2
data exchange inactive
DATA_EXCHANGE_ACTIVE
BOOL
3
data exchange active
T_M_COM_ASI_CH_PRM Description
This DDT is used to manage the parameters of slave devices. They can be modified without stopping the AS-Interface bus master.
Management of the parameters is done via READ_PARAM_MX, WRITE_PARAM_MX, SAVE_PARAM_MX and RESTORE_PARAM_MX instructions.
NOTE: Use of this object requires a thorough knowledge of AS-Interface communication principles.
The following table shows the T_M_COM_ASI_CH_PRM structure status word bits:
Name
Type
Bit
Meaning
Access
PARAM_A
ARRAY [0..31] of INT
–
parameter values of slaves 0A to 31A (1 word per slaves, only 4 bits used)
read/write
PARAM_B
ARRAY [0..31] of INT
–
parameter values of slaves 0B to 31B (1 word per slaves, only 4 bits used)
read/write
EPARAM_A
ARRAY [0..31] of INT
–
parameter values echoed by slaves 0A to 31A (1 word per slaves, only 4 bits used)
read
EPARAM_B
ARRAY [0..31] of INT
–
parameter values echoed by slaves 0B to 31B (1 word per slaves, only 4 bits used)
read