Overview
The 7321 is a single-channel, solid-state relay that allows your data logger to control one or two dc devices.
Read MoreBenefits and Features
- Generally more economical for one or two channel applications as opposed to a 4- or 6-channel relay driver
Images
Detailed Description
The 7321 is the same device as CRYDOM's model D1D07 that's distributed through Newark Electronics and others. One data logger digital port controls each relay.
Normally Open
This relay is usually operated in the Normally Open state. In this state, when the digital port is set high, the relay is closed. Wiring for this situation is as follows:
| Data Logger Terminal | Relay Screw Terminal |
| ground | 4 |
| digital port (i.e., C1, C2,...) |
3 |
Normally Closed
The 7321 can also be operated in the Normally Closed state. In this state, when the digital port is low, the relay is closed. Wiring for this situation is as follows:
| Data Logger Terminal | Relay Screw Terminal |
| 5V | 3 |
| digital port (i.e., C1, C2,...) |
4 |
Specifications
| Function | Allows a data logger to control one or two dc devices. |
| Number of Channels | 1 |
| Operating Temperature | -40° to +100°C |
| Operating Voltage | 1 to 100 Vdc |
| Control Voltage | 3.5 to 32 Vdc |
| Control Current | 1.6 mA (@ 5 Vdc) |
| Rated Current/Voltage | 7 A (@ 100 Vdc) |
| Dimensions | 5.99 x 2.74 x 5.99 cm (2.36 x 1.08 x 2.36 in.) |
| Weight | 108.86 g (0.24 lb) |
Compatibility
Please note: The following shows notable compatibility information. It is not a comprehensive list of all compatible products.
Data Loggers
| Compatible | Note | |
|---|---|---|
| 21X (retired) | ||
| CR10 (retired) | ||
| CR1000 (retired) | ||
| CR10X (retired) | ||
| CR200X (retired) | ||
| CR206X (retired) | ||
| CR23X (retired) | ||
| CR295X (retired) | ||
| CR3000 (retired) | ||
| CR500 (retired) | ||
| CR5000 (retired) | ||
| CR510 (retired) | The CR510 has only one digital port capable of providing control signal. | |
| CR800 (retired) | ||
| CR850 (retired) | ||
| CR9000 (retired) | ||
| CR9000X (retired) |
FAQs for
Number of FAQs related to 7321: 2
-
The following relay devices can be used with the CR800 and the CR850:
- 7321
- A6REL-12*
- A21REL-12
- LR4
- SDM-CD8S
- SDM-CD16AC
- SDM-CD16ACA
- SDM-CD16S
The CR800 and the CR850 can also be used with a wide variety of third-party relay devices.
*Because the CR800 and the CR850 only have four digital ports, they do not have the ability to switch all six of the relays on the A6REL-12.
-
Either the PortSet() or the WriteIO() instruction can be used to open and close the 7321 relay. These instructions are commonly used in conjunction with an IfThen/EndIf construction.
In this first example, the program closes the relay at the top of a 60 second interval and then opens the relay after ten seconds:
BeginProg
Scan (1,Sec,0,0)
If IfTime (0,60,Sec) Then
PortSet(1,1)
ElseIf IfTime (10,60,Sec) Then
PortSet(1,0)
EndIf
NextScan
EndProg
In this second example, the WriteIO() instruction is used to close the 7321 relay based on the measured panel temperature:
Public PTemp
BeginProg
Scan (1,Sec,0,0)
PanelTemp (PTemp,_60Hz)
If PTemp > 25 Then
WriteIO (&B00000001,&B00000001)
Else
WriteIO (&B00000001,&B00000000)
EndIf
NextScan
EndProg