[DhwPltMod21] Plant operating mode determination for domestic hot water
Program block, name / node subtype: [DhwPltMod21] Plant operating mode determination for domestic hot water
Library hierarchy: Heating equipment
Family: DhwPltMod
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*SttUpAlmHdl21a in controllers with system version < 1.5 |
Configurator
Program blocks are stored in the library without I/Os. Use the auto-create and auto-connect functions to create I/Os and/or to connect them to the interface blocks, e.g., R_A, CMD_B. Alternatively, take the I/Os from the folder containing the predefined I/Os in the library and/or from the plant and connect them to the interface blocks.
Determines the plant operating mode by considering various possible sources (e.g., scheduler, manual operation, room unit).
Possible operating modes
Operating mode | Description |
|---|---|
Off | The charge logic and the charge circuit are off. |
On | The charge logic and the charge circuit are on. |
The operating mode is shown on BACnet with a multistate calculated value "Present operating mode" with the states "Off" and "On".
A parameter in the program is preset to prevent the plant from running. This is useful for testing data points. It must be switched off to start the plant.
"Startup function and alarm handling" controls the startup behavior of the plant after power-on. There is a delay after startup, "DlySttUp", of about 50 seconds. Do not change this delay. Change the delay, "DlyOn", so that it is different for each plant. This ensures that plants start one after another and do not overload the electrical system. There is also a collection and aggregation of all faults and alarms from the plant. If a local alarm lamp and/or reset button is required, an alternative can be selected.
This program block has the following optional functions:
Option: External off
Interface that can be connected to a program logic for shutting down the plant.
Option: Operating mode switch (1xMI=2xBI)
Reads the state of an operating mode switch, normally at the front of the electrical panel, and has the states "Auto", "Off", and "On".
Option: Operation indication (1xBO)
Commands a lamp (usually green) that turns on if the plant is running or that blinks if a switching operation is in progress.
Option: Scheduler
Scheduler of type MSCHED with the states "Protection", "Economy", "Pre-Comfort", and "Comfort" that switches the plant off and on.
Name | Description | Type | Alarm / Notification class | Trend / Type | |
|---|---|---|---|---|---|
OpModMan | Manual operating mode selection | MCnfVal: Multistate configuration value | N/A | Yes, 4 | |
SttUpAlmHdl | Startup function and alarm handling | [SttUpAlmHdl22a] Startup & alarm handling, acknowledge & reset, 3 priorities | N/A | N/A | |
PrOpMod | Present operating mode | MCalcVal: Multistate calculated value | N/A | Yes, 4 | |
RsnPrOpMod | Reason for present operating mode | MCalcVal: Multistate calculated value | No | Yes, 4 | |
Name | Description | Type | Alarm / Notification class | Trend / Type | |
|---|---|---|---|---|---|
OpModSwi | Operating mode switch | MI: Multistate input | No | Yes, 4 | |
Sched | Scheduler | BSchedule: Binary scheduler | N/A | N/A | |
OpInd | Operation indication | BO: Binary output | No | Yes, 4 | |
Description |
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External off |