CTH200 Series PLC User Manual
7 Power Budget
CTH200 series CPU has an internal power supply for the unit and the expansion modules. It also
provides 5VDC logic power supply, which can be used for power supply of any expansion in the
system. Pay close attention to the system configuration to ensure that the CPU can provide the
5V power for the selected expansion modules. If the configuration requires more power than the
CPU provides, some expansion modules must be removed or select CPU that can provide more
power. See Chapter 7.2 5VDC Power for detailed information on CTH200 CPU's 5VDC logic
budget and expansion module 5VDC power requirements.
CTH200 series CPU also provide 24VDC sensor power supply (except PSC266), which can
provide 24VDC for input, relay coil on expansion module or other power supply. If the required
power exceeds budget, an external 24VDC power supply must be added. For specific CTH200
CPU 24VDC sensor power budget, refer to Chapter 7.3 24VDC Power. If you need an external
24VDC power supply, make sure that the power supply is not connected in parallel to the sensor
power supply of the CTH200 series CPU. To improve electrical noise protection, please connect
to the common terminal (M) of different power sources.
7.1 Power Requirements
CPU provides 5VDC and 24VDC power supply itself:
Each CPU has an external 24VDC power supply, which can provide 24VDC for input and relay
coil of the expansion module.
When expansion unit connect, CPU provides 5VDC power. If the 5VDC requirement of the
extension unit exceeds the CPU rating power output, the extension unit must be unloaded until
the demand is within the predetermined power supply. Chapter 4 Technical Specifications
provides information on CPU power budget and expansion module power requirements.
If 5VDC power exceeds CPU power budget, it may unable to connect maximum
modules the CPU allowed.
Notice
An external 24VDC power supply connected in parallel to CTH200 DC sensor power
supply can cause a conflict because each power supply seeks to establish its own
potential output. This conflict will shorten the service life of one or two power supplies or
cause an immediate failure, then uncertain operation of the PLC system. The
unpredictable operation may cause personal injury and equipment damage.
CTH200 CPU's 24VDC sensor and any external power supply should be supplied at different
points. A separate connection for utility power is allowed.
To Next Page
Loading...
Need help?
General