Modbus Plus language objects
Implicit Exchange Language Object
At a Glance
Bit Objects
This page describes all implicit exchange language objects for Modbus Plus communication, which can be displayed or modified by the application program (PL7
Micro/Junior/Pro ; Communication applications ; Volume 1).
The table below shows the different bit objects for implicit exchange.
Object (1) Function
%Ixy.MOD.ERR
Module error bit
%Ixy.i.ERR
Channel error bit
Meaning
This bit, when set to 1, indicates a module error (at least one of the channels has an error)
When this bit is at 1, it indicates a line fault.
Key
(1) Address xy.i
z z z x: corresponds to the rack number y: corresponds to the module number i: corresponds to the channel number
Word Objects The table below shows the different word objects for implicit exchange.
Object (1)
%IWxy.i.0
%IWxy.i.1
Function
Requests
Reserved
Meaning
Status of communication paths z z z z
Byte 0: number of communication functions processed simultaneously in client mode x0 = 1: communication function 1 x1 = 1: communication function 2 x2 = 1: communication function 3 x3 = 1: communication function 4 z z z z
Byte 1: number of communication functions processed simultaneously in server mode x8 = 1: communication function 1 x9 = 1: communication function 2 x10 = 1: communication function 3 x11 = 1: communication function 4
-
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Modbus Plus language objects
Object (1)
%IWxy.i.2 to
%IWxy.i.5
%IWxy.i.6
Function
Periodic exchanges
Status bit availability
Status of the specific inputs
%IWxy.i.7 to
%IWxy.i.9
Status of the specific inputs
%IWxy.i.10
Status of the specific inputs
New presence of specific inputs
%IWxy.i.11 to
%IWxy.i.13
New presence of specific inputs
%IWxy.i.14
New presence of specific inputs
Meaning
When set to 1, the bit from rank j indicates that the station’s global data is operational, and that the station takes part in the token exchange.
z where j = 0 to 15 of word %IWxy.i.2:xj for stations
1 to 16, z where j = 0 to 15 of word %IWxy.i.3:xj for stations z
17 to 32, where j = 0 to 15 of word %IWxy.i.4:xj for stations
33 to 48, z where j = 0 to 15 of word %IWxy.i.5:xj for stations
49 to 64.
Example: bit 5 of word %IWxy.i.3:x5 indicates that station 22 takes part in global data exchange.
The bit from rank j is reset to 0 when the global data is read by the application (GetGlobalData, command 0x0A) or in the case of a STOP/RUN by the PLC.
Byte 0: the specific inputs of all remote stations are z z z available x0 = 0: the specific inputs are not available x0 = 1: the specific inputs are available x1 to x7: reserved
Byte 1: a bit at 1 indicates the presence of a station that is transmitting specific inputs. Stations 1 to 8.
A bit at 1 indicates the presence of a station that is transmitting specific inputs. Stations 9 to 56.
Byte 0: a bit at 1 indicates the presence of a station that is transmitting specific inputs. Stations 57 to 64.
Byte 1: a bit at 1 indicates the presence of new specific inputs. Stations 1 to 8.
A bit at 1 indicates the presence of new specific inputs. Stations 9 to 56.
Byte 0: a bit at 1 indicates the presence of new specific inputs. Stations 57 to 64.
Byte 1: not used
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Modbus Plus language objects
Object (1) Function
%IWxy.i.15
Status bit availability
%IWxy.i.16 to
%IWxy.i.18
Status of the specific outputs
Status of the specific inputs
%IWxy.i.19
Status of the specific inputs
Meaning z z z
Byte 0: the specific outputs are available for all remote stations x0 = 0: the specific outputs are not available x0 = 1: the specific outputs are available x1 to x7: reserved
Byte 1: a bit at 1 indicates the presence of a station that is receiving specific outputs. Stations 1 to 8.
A bit at 1 indicates the presence of a station that is receiving specific outputs. Stations 9 to 56.
Byte 0: a bit at 1 indicates the presence of a station that is receiving specific outputs. Stations 57 to 64.
Byte 1: not used
Key
(1) z z z
Address xy.i
x: corresponds to the rack number y: corresponds to the module number i: corresponds to the channel number
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