ZWorld Exp-A/D12, User Manual

Page: 83 / 111

XP8500
and
Exp-A/D12 PLCBus s 83
• void set4adr( int adr )
Sets the current address for the PLCBus. All read and write operations
access this address until a new address is set.
A 12-bit address may be passed to this function, but only the last four
bits will be set. Call this function only if the first eight bits of the
address are the same as the address in the previous call to set12adr.
PARAMETER:
adr
contains the last four bits (bits 8–11) of the
physical address.
LIBRARY:
DRIVERS.LIB
.
• char _eioReadD0( )
Reads the data on the PLCBus in the BUSADR0 cycle.
RETURN VALUE: the byte read on the PLCBus in the BUSADR0
cycle.
LIBRARY:
EZIOPLC.LIB
,
EZIOPLC2.LIB
,
EZIOMGPL.LIB
.
• char _eioReadD1( )
Reads the data on the PLCBus in the BUSADR1 cycle.
RETURN VALUE: the byte read on the PLCBus in the BUSADR1
cycle.
LIBRARY:
EZIOPLC.LIB
,
EZIOPLC2.LIB
,
EZIOMGPL.LIB
.
• char _eioReadD2( )
Reads the data on the PLCBus in the BUSADR2 cycle.
RETURN VALUE: the byte read on the PLCBus in the BUSADR2
cycle.
LIBRARY:
EZIOPLC.LIB
,
EZIOPLC2.LIB
,
EZIOMGPL.LIB
.
• char read12data( int adr )
Sets the current PLCBus address using the 12-bit
adr
, then reads four
bits of data from the PLCBus with BUSADR0 cycle.
RETURN VALUE: PLCBus data in the lower four bits; the upper bits
are undefined.
LIBRARY:
DRIVERS.LIB
.