Chapter 4
Configuration
MAN_905G_1.16
Page 72
then mask out the high 16 bits (MVM with mask value FFFF). This will result in a long integer
value in the range 0 to 65535.
Alternatively, use a long integer file type to transfer the analog value as a long integer in the
range 0-65535.
Pulse I/O
Pulse counts from the remote 905U modules are shown as a 16-bit register. When the
register rolls over, from ‘FFFF’ (hex), the next value will be ‘0001’. The register will only
have a value of ‘0000’ when the remote module starts up, and the previous count is lost. This
value will indicate that the counter has reset.
Note:
The values from the 905G module are 16 bit
unsigned
values. When they are copied to
the Integer file in the PLC, they will be treated as 16 bit
signed
values. These values may be
converted to the original (unsigned) values using the MOV and MVM instructions described
in the previous section (Analog I/O). Again, using a Long Integer type will avoid this
problem.
500 CPU (SLC and MicroLogix) file types and addressing
The 905G provides a linear address space of 10,000 data words. This is compatible with
PLC2 addresses, but does not match the addressing used by the 500CPU modules (SLC and
Micrologic). These address data by file number and file offset. To address an I/O register,
L,
in the 905G, use DF1 file number
L
/ 100, with the remainder value (L % 100) as the DF1
file offset. For example, to read I/O register 2643 in the 905G, read from file number 26,
offset 43.
