DISTRIBUTED I/O
3 EN0B-0090
Table 3. Node Object network variables.
NV Name Type Range Description
nviRequest SNVT_obj_request RQ_NORMAL
RQ_DISABLE
RQ_ENABLE
RQ_UPDATE_STATUS
RQ_REPOPRT_MASK
RQ_SELF_TEST
Upon receiving an update to nviRequest, nvoStatus is
updated.
RQ_SELF_TEST is used only in the XFL522 analog
output module for outputs configured as a motor. In
this case, a synchronization is performed to set the
actuator in the 0% position.
nvoStatus SNVT_obj_status Reports the status of the node upon request through
nviRequest.
nciNetConfig SNVT_config_src CFG_LOCAL (default)
CFG_EXTERNAL
This configuration variable is set to CFG_LOCAL at
the factory and whenever the rotary HEX switch is
reset. If it is set to CFG_EXTERNAL, a network
manager will assign a network address for the node. In
this case, the module will not modify its location string
as long as the rotary HEX switch is not reset.
nvoFileDirectory SNVT_address Points to a file directory in the address space of the
Neuron® chip containing descriptors for the files in the
module. It is used to access the configuration pro-
perties stored in configuration parameter files
accessed by network management read/write
messages.
SCPTminSendTime SNVT_time_sec 1.0 to 10.0s
(default = 1.0)
Defines the minimum period of time between output
variable transitions. This configuration property is
applicable only to output NVs of the input modules.
SCPTmaxSendTime SNVT_time_sec 1.0 to 6553.4s
(default = 60.0s)
Defines the maximum time period of time before out-
put NVs are automatically updated. It must be set to a
higher number than SCPTminSendTime. This con-
figuration property is applicable only to output NVs of
the input modules.
XFL52xB Module Response Times
The response time of Distributed I/O modules is defined as
the period of time between the updating of the physical signal
and the updating of the NV (or vice versa). The response
time varies somewhat due to certain factors and is also
dependent upon the module type (refer also to Table 4).
The total system response time represents the sum of the
response times of all involved devices. When operating in the
open mode, a fast response time of 40 ms can be achieved,
thus enabling them to be employed in time-critical
applications.
Table 4. Response time (RT)
Module Typical RT
(sec)
Max. RT
(sec)
Min. time between
2 updates
XFL521B 0.8 1.6 SNVTMinSendTime
(default: 1 sec)
XFL522B 0.2 0.4 n.a.
XFL523B 0.3 0.5 SNVTMinSendTime
(default: 1 sec)
XFL524B 0.2 0.4
To Next Page
Loading...
Need help?
General
