Weidmuller WI-GTWY-9 User Manual page 78

WI-GTWY-9-xxx Wireless Gateway V1.18
Discrete I/O
The value of a digital I/O point is stored in the WI-GTWY-9-xxx database as a hexadecimal ' 0000'
("off") or hex ' FFFF' ("on"). However the WI-GTWY-9-xxx will generate either a '0' ("off") or
'1' ("on") to a binary file when initiating a "Typed Logical Write" command or responding to a
"Typed Logical Read" command. Similarly, the WI-GTWY-9-xxx will accept '0' or '1' from
responding device to a "Typed Logical Read" command or from an initiating device generating a
"Typed Logical Write" command and store '0000' or 'FFFF' in the database location. The file type
for a binary file (bit file) is 0x85.
In the PLC (that is, the DF1 host device), discrete values ("bits") are stored in 16 bit registers -
each register stores 16 bit values (or 16 discrete values). You can only transfer these values in
groups of 16. That is, a read or write command will transfer a minimum of 16 bits to/from the WI-
GTWY-9-xxx. If more than 16 are transferred, then they will be transferred in multiples of 16.
You cannot transfer an individual bit - you must transfer the 16 bits in that PLC register, which
will be transferred to/from 16 consecutive I/O registers in the WI-GTWY-9-xxx.
Note: The PLC reads or writes digital bits starting at the LSB of each register. In the WI-GTWY-
9-xxx, only one bit is written to each I/O register, and this is the MSB.
Analog I/O
Analog I/O from the remote WI-I/O 9-x modules are 16 bit register value. A value of 8192 (hex
2000) represents 0mA. A value of 49152 (hex C000) represents 20mA. Each mA has value of
2048 (hex 0800) - a change of 4096 (hex 1000) is equivalent to a change of 2mA. A 4-20mA
signal will vary between 16384 (hex 4000) and 49152 (hex C000). A 0-20mA signal will vary
between 8192 (hex 2000) and 49152 (hex C000).
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