2
1-1 Features
Miniature High-performance The SP-series PCs are extremely compact yet have a programming capacity
of about 100 instructions in the SP10 or about 240 instructions in the SP16
and SP20. The SP10 is equipped with 34 different instructions and the SP16
and SP20 are equipped with 38 instructions. With real programming capabili-
ty in such a small package, these compact PCs are ideal for mounting in a
control box or in the device being controlled.
High-speed Processing The minimum instruction execution time is as short as 0.2 microseconds. The
input delay is only 400 microseconds.
Low Maintenance The user program is automatically transferred from RAM to EEPROM, elimi-
nating the need to back up memory, which can be rewritten up to 5,000
times.
Input Signal Filter To prevent errors due to chattering or external noises on input signals, the
input circuits are provided with filter timers that can be set to 0, 1, 5, or 10
ms.
Efficient Distributed Control Up to four SP-series PCs can be connected with a Link Adapter. A total of
128 points can be linked between the PCs, which means that up to 32 points
can be processed by one SP-series PCs. Each PC still operates according to
its own program.
Easy-to-use Analog Timers One analog timer is provided with the SP10 and two analog timers are pro-
vided with the SP16 and SP20. The set time of these analog timers can be
changed even while the PC is operating, with adjustment screws located in-
side the front cover.
Reversible Drum Counter A reversible drum counter can be programmed for various counter present
value ranges.
Step Instructions Up to five steps (four processes) of instructions can be created, making it
easy to program start-stop control.
Shift Register A 16-bit shift register can be used to control various operations easily.
Addition, subtraction, ANDs, and ORs can be performed on16-bit data.
Differentiated Instructions Up to 16 rising edge/falling edge differentiated instructions can be pro-
grammed.
1-2 PC Basics
A PC (Programmable Controller) is basically a CPU (Central Processing
Unit) containing a program and connected to input and output (I/O) devices.
The program controls the PC so that when an input signal from an input de-
vice turns ON, the appropriate response is made. The response normally
involves turning ON an output signal to some sort of output device. The input
devices could be photoelectric sensors, pushbuttons on control panels, limit
switches, or any other device that can produce a signal that can be input into
the PC. The output devices could be solenoids, switches activating indicator
lamps, relays turning on motors, or any other devices that can be activated
by signals output from the PC.
Arithmetic/Logical
Instructions
PC Basics Section 1-2
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