If the source value exceeds the set limits, the safety value is sent to the target variables.
The module lets you update the values of between three and six variables in Slave devices with values coming from a Master device. The Master and Slave set is called a "group". A Master may be included in only one group.
The module is preset for up to three default variables for all CAREL templates with Master-Slave architecture.:
Tamb (Room temperature)
rH% (percent humidity)
Tdew (dew point)
Variables appear set in page template config and their limits and safety values can be edited.
Default configuration already differentiates between:
templates only used as Masters (for which only source variables are indicated)
models only used as Slaves (for which only target variables are indicated)
templates used as both Master and Slave (for which source and target variables are indicated)
To radically change a template configuration, for example, changing variables or using extra variables (i.e.: to be used for special applications), you must indicate:
source variables (if the template is only used as a Master or as Master and Slave)
target variables (if the template is only used as a Slave or as Master and Slave)
any additional variables to be monitored
any variables supporting those devices that do not recognize repeated writes of the same value and, therefore, could signal an erroneous off line alarm (see following paragraph Heartbeat management)
extra variable (optional)
Module data must reflect the modes in which that template's devices are used in the system: if all that template's devices are used as Masters only, data must only be specified in the Master section.
If all that template's devices are used as Slaves only, data must only be specified in the Slave section.
If that template's devices are both Master and Slave, all data must be set. Data settings divide system devices into their relevant Master and Slave tabs.
After setting up the template, divide devices between Master and Slave. To do this, use the Master and Slave pages that let you:
Master: exclude devices that are not Masters (and are therefore Slaves)
Slave: exclude certain Slave devices from updating
After setting which devices are Masters and Slaves, manually run broadcast (see page Slave). The source variable value is only cyclically propagated if each source variable:
has a value in the indicated range
has valid values (i.e.: the Master device is online and on)
has no active alarm
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If the source value exceeds the set limits, the safety value is sent to the target variables. |
Some programmable devices base their "online device" status on status changes of variables dedicated to the supervisor. If the supervisor repeatedly writes the same value in the variable, the device does not intercept writing and erroneously signals an off line status.
With heartbeat on a digital variable and, upon request, even on an analog variable, writing from Master to its Slaves is at regular intervals to indicate that the supervisor is on.
See also
Dew point broadcast: introduction
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