PLCSTAT
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161
Global communication status (DIOSTATE: word8)
The conditions are true when the bits are set to 1.
Bit allocation for word8:
Global cumulative error counter for cable A (DIOSTATE: word9)
The conditions are true when the bits are set to 1.
Bit allocation for word9:
Global cumulative error counter for cable B(DIOSTATE: word10)
The conditions are true when the bits are set to 1.
Bit allocation for word10:
Bit
Allocation
1
Comm. function display
2
Cable A status
3
Cable B status
5 - 8
Communication counter lost
9 - 16
Cumulative repetition counter
Bit
Allocation
1 - 8
Counts recognized errors
9 - 16
Counts zero responses
Bit
Allocation
1 - 8
Counts recognized errors
9 - 16
Counts zero responses
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PLCSTAT
162
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RIO status (DIOSTATE: word11 to word106)
Words 11 to 106 are used to describe the RIO station status, three status words are 
planned for each I/O station.
The first word in each group of three shows the communication status for the 
corresponding I/O station:
The second word in each group of three is the cumulative I/O station error counter 
at cable A for the corresponding I/O station:
The third word in each group of three is the cumulative I/O station error counter at 
cable B for the corresponding I/O station:
NOTE: For PLCs where the I/O station 1 is reserved for the local I/O, words word11 
to word13 are allocated as follows:
Bit
Allocation
1
Communication health
2
Cable A status
3
Cable B status
5 - 8
Counter for lost communications
9 - 16
Cumulative repetition counter
Bit
Allocation
1 - 8
Minimum one error in words 2 to 4
9 - 16
Counts zero responses
Bit
Allocation
1 - 8
Minimum one error in words 5 to 7
9 - 16
Counts zero responses
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PLCSTAT
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163
word11 shows the global I/O station status:
word12 is used as a 16 bit I/O bus error counter.
word13 is used as a 16 bit I/O repetition counter.
Bit
Allocation
1
All modules OK
9 - 16
Counts, how often a module is regarded as not OK, counter overflow is at 255
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PLCSTAT
164
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C# Windows Viewer - Image and Document Conversion & Rendering in
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165
16
Unity Pro
READREG
33002515 07/2012
READREG: Read register
Introduction
This chapter describes the READREG block.
What Is in This Chapter?
This chapter contains the following topics:
Topic
Page
Description
166
Mode of Functioning
169
Parameter description
170
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READREG
166
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Description
Function description
With a rising edge at the REQ input, this function block reads a register area from an 
addressed slave via Modbus Plus.
EN and ENO can be configured as additional parameters.
NOTE: When programming a READREG function, you must be familiar with the 
routing procedures used by your network. Modbus Plus routing path structures will 
be described in detail in "Modbus Plus Network Planning and Installation Guide".
NOTE: This function block only supports the local Modbus Plus interface (no NOM).
If using a NOM please work with the CREAD_REG block from the communication 
block library.
NOTE: This function block does not support TCP/IP- or SY/MAX-Ethernet. 
If TCP/IP- or SY/MAX-Ethernet is needed, please use the CREAD_REG block from 
the communication block library.
NOTE: Several copies of this function block can be used in the program. However, 
multiple instancing of these copies is not possible.
Representation in FBD
Representation:
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READREG
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167
Representation in LD
Representation:
Representation in IL
Representation:
CAL READREG_Instance (REQ:=StartReadOnce,
NODEADDR:=DeviceAddress, ROUTPATH:=RoutingPath,
SLAVEREG:=OffsetAddress, NO_REG:=NumberOfRegisters,
REG_READ:=ArrayForValuesRead,
NDR=>SetAfterReadingNewData, ERROR=>SetInCaseOfError,
STATUS=>ErrorCode)
Representation in ST
Representation:
READREG_Instance (REQ:=StartReadOnce,
NODEADDR:=DeviceAddress, ROUTPATH:=RoutingPath,
SLAVEREG:=OffsetAddress, NO_REG:=NumberOfRegisters,
REG_READ:=ArrayForValuesRead,
NDR=>SetAfterReadingNewData, ERROR=>SetInCaseOfError,
STATUS=>ErrorCode;
READREG
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Parameter description
Description of the input parameters:
Description of input / output parameters:
Description of the output parameters:
Parameter
Data type
Meaning
REQ
BOOL
With a rising edge at the REQ input, this function 
block reads a register area from an addressed slave 
via Modbus Plus.
NODEADDR
INT
Device address within the target segment
ROUTPATH
DINT
Routing path to target segment
SLAVEREG
DINT
Offset address of the first 4x register in the slave to 
be read from
NO_REG
INT
Number of registers to be read from slave
Parameters
Data type
Meaning
REG_READ
ANY_ARRAY_WORD
Writing data
(For the file to be read a data structure must be 
declared as a located variable.)
Parameters
Data type
Meaning
NDR
BOOL
Set to "1" for one cycle after reading new data
ERROR
BOOL
Set to "1" for one scan in case of error
STATUS
WORD
Error Code
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169
Mode of Functioning
Function mode of READREG_DFB blocks
Although a large number of READREG function blocks can be programmed, only four 
read operations may be active at the same time. It makes no difference whether 
these operations are performed using this function block or others (e.g. MBP_MSTR, 
CREAD_REG). All function blocks use one data transaction path and require multiple 
cycles to complete a task. The status signals NDR and ERROR report the function 
block state to the user program.
The complete routing information must be separated into two parts:
z
in the NODEADDR of the destination node (regardless of whether it is located in the 
local segment or in another segment) and 
z
the routing path, in case there is a link via bridges. 
The resulting destination address consists of these two information components.
The routing path is a DINT data type, which is interpreted as a sequence of two-digit 
information units. It is not necessary to use "00" extensions (e.g. both routing paths 
4711 and 47110000 are valid, for NODEADDR 34 the result is destination address 
47.11.34.00.00).
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Parameter description
REQ
A rising edge triggers the read transaction.
The parameter can be specified as an address, located variable, unlocated variable 
or literal.
NODEADDR
Identifies the node address within the target segment.
The parameter can be specified as an address, located variable, unlocated variable 
or literal.
ROUTPATH
Identifies the routing path to the target segment. The two-digit information units run 
from 01 64 (see Mode of Functioning, page 169). If the slave resides in the local 
network segment, ROUTPATH must be set to "0" or must be left unconnected.
The parameter can be specified as an address, located variable, unlocated variable 
or literal.
SLAVEREG
Start of the area in the addressed slave from which the source data is read. The 
source area always resides within the 4x register area. SLAVEREG expects the 
source reference as offset within the 4x area. The leading "4" must be omitted (e.g. 
59 (contents of the variables or value of the literal) = 40059).
The parameter can be specified as an address, located variable, unlocated variable 
or literal.
NO_REG
Number of registers to be read from slave processor (1 ... 100).
The parameter can be specified as an address, located variable, unlocated variable 
or literal.
NDR
Transition to ON state for one program cycle signifies receipt of new data ready to 
be processed.
The parameter can be specified as an address, located variable or unlocated 
variable.
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