5.1 Introduction of Devices
This section describes the values and strings processed by the PLC. It also describes the functions of devices
that include input, output, and auxiliary relays, as well as timers, counters, and data registers. The PLC
simulates external devices in the PLC’s internal memory, so the word “device” is a generic name that refers to
all the internal memory locations in the PLC. A device can be a bit device or a word device. Bit devices
simulate coils, contacts and flags, while word devices simulate registers.
5.1.1 Device Table
Type Device name Number of devices Range
Bit device
Input relay X 1024 X0.0–X63.15
Output relay Y 1024 Y0.0–Y63.15
Data register
D 48,0000 D0.0–D29999.15
W 48,0000
W0.0–W29999.15 *
4
Auxiliary relay M 8192 M0–M8191
Special auxiliary relay SM 4096 SM0–SM4095
Relay S 2048 S0–S2047
Timer T 512 T0–T511
Counter C 512 C0–C511
32-bit counter HC 256 HC0–HC255
Word device
Input relay X 64 X0–X63
Output relay Y 64 Y0–Y63
Data register
D 30000 D0–D29999
W 30000
W0–W29999 *
4
Special auxiliary relay SR 2048 SR0–SR2047
File register FR 65536 FR0–FR65535
Timer T 512 T0–T511
Counter C 512 C0–C511
32-bit counter HC
256（512 words）
HC0–HC255
Index register E
10 E0–E9
5
E10–E14 *
4
Constant*
1
Decimal system K
16 bits: -32768 to 32767
32 bits: -2147483648 to 2147483647
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