Slave Parameter Data (*_Slvparamsta) - Omron CJ1W-PRT21 Operation Manual

Name of Device Variable for CJ-
series Unit
*_DatXchgActSta
*_ClearSta
*_FreezeSta
*_SyncSta
*_WdtDsblSta
*_WdtTmBaseSta
CJ-series PROFIBUS Slave Unit Operation Manual for NJ-series CPU Unit (W510)
3 Data Exchange with the CPU Unit
Type R/W Description
BOOL R Data exchange
active
BOOL R CLEAR
BOOL R FREEZE
BOOL R SYNC
BOOL R Watchdog dis-
abled
BOOL R Watchdog
timebase 1 ms
Function
FALSE:
The slave unit is not in data exchange mode.
TRUE:
The slave unit is exchanging I/O data with the
master. When this flag is TRUE, the assigned
slave output area of the Host CPU contains
data sent by the PROFIBUS master. When the
flag is FALSE, the user should not process the
data from this area since its validity cannot be
guaranteed.
This does not necessarily mean that slave out-
puts are updated cyclically:
• If the communication watchdog timer is dis-
abled by the master (*_WdtDsblSta), the I/O
data refresh interval may be of indefinite
length.
• In 'Clear' mode (*_WdtDsblSta), only the
slave inputs are read, while all slave outputs
are forced to FALSE.
FALSE: Not in CLEAR mode.
TRUE: The master has sent a global control
command CLEAR, which resets all outputs of
all the addressed slaves on the network.
FALSE: Not in FREEZE mode.
TRUE: The slave has accepted a global control
command FREEZE from its master. The slave
input data from the CPU is not updated at the
PROFIBUS-DP interface until the next FREEZE
command to this slave, or until the slave
receives an UNFREEZE command.
FALSE: Not in SYNC mode.
TRUE: The slave has accepted a global control
command SYNC from its master. The slave out-
put data to the CPU is not updated at the CPU
I/O bus interface until the next SYNC command
to this slave, or until the slave receives an
UNSYNC command
FALSE: The slave's watchdog is enabled by the
PROFIBUS-DP master, and the actual watch-
dog time is indicated in Watchdog Factors (see
section 3-7-1 Slave Parameter Data
(*_SlvParamSta)).
TRUE: The master has disabled the slave's
watchdog. If the Master-Slave communication
fails, the slave will not exit data exchange
mode, and its outputs will keep their state as
received in the last data exchange telegram.
FALSE: The slave's watchdog uses the default
timebase of 10 ms. The product of the two
Watchdog Factors is multiplied by 10 ms to give
the actual watchdog time (see section 3-7-1

Slave Parameter Data (*_SlvParamSta)).

TRUE: The slave's watchdog uses the optional
timebase of 1 ms. The product of the two
Watchdog Factors is multiplied by 1 ms to give
the actual watchdog time (see section 3-7-1

Slave Parameter Data (*_SlvParamSta)).

3
3-17