Toshiba T2N - Manual (Page 68)

3.Application Precautions for I/O Modules
User’s manual 53
(1) The DC output module needs an external power supply to drive
output transistors. For each common, connect the load power to
the approprite terminal.(For details, see 2.3 I/O module
specifications)
If the wrong polarity of the power supply to the terminal is
connected,the module will be damaged. Check the polarity
before connection.
(2) Protection coordination against over-current of DC output module
Type of module Protection
DO31
(16-point
output)
A fuse of 5A per common(16 points) is built in this
DC output module. For an overload and load
short-circuit, the transistor will not be
protected. This fuse,however,protects the DC
output module and the external cable from burn-out.
DO32
(32-point
output)
A fuse of 2A per common(8 points) is built in this
DC output module. For an overload and load
short-circuit, the transistor will not be
protected. This fuse,however,protects the DC
output module and the external cable from burn-out.
DO235
(64-point
output)
The load short-circuit,etc. will cause burn-out of the
module and external cable,because a protection fuse is
not built in this DC output module. Therfore, install an
appropriate fuse on the outside to prevent accidental
burn-out.
(3) A diode as shown in the figure below is built in to protect the
transistor from transient overvoltage.
D: Bypasses transient overvoltage to the power supply and suppresses
the voltage between the collector and emitter of the transistor.
D
3.2
DC Output Module
Application Precautions