Specifications

3. Special Devices
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3-3
Additional Information
M: Read Only Relay, can work as a contact yet cannot work as an output coil. But M1131and M1132 are used for system, they can’ t work as a contact or a
output coil.
D: Read Only Register.
Here are the descriptions of the special devices, also refer to chapters 6 and 7 for more details.
Device Descriptions Device Descriptions Device Descriptions
M1025
If the PLC receive an illegal communication
service request when it is connected with an
HPP, PC or HMI (Human-Machine-Interface),
the M1025 will be set and save the error
code in D1025.
D1001
Users have access to where the software version is
saved in Device D1001, e.g. D1001 = H 4027 is an
indication of Version 2.7. HPP is utilized to read
the data. When “Knnnnn” is displayed, simply press
the <H> key to switch to the HEX display mode.
D1121
Saves the PLC
communication
addresses. This is a
Latched Register.
M1028
OFF: the time base of timer T64~T126 is
100ms.
ON: the time base is 10ms.
D1003
Sums up the memory content of the PLC. Users
could use this data register to identify the internal
program of the PLC.
M1143
Used with the MODRD/MODWR commands:
OFF: the ASCII mode
ON: the RTU mode
D1025
Error Code:
01: illegal command
02: illegal device
command
03: requested data exceeds
the range
07: checksum error
D1119
Identify the PLC
operating mode:
1: A/D operating mode
2: D/A operating mode
3: A/D, D/A operating
mode
4: normal mode
(DI/DO)
3.3. High Speed Counters
1-phase input 1-phase 2 inputs 2-phase inputsType
Input C235 C236 C237 C238 C241 C242 C244 C246 C247 C249 C251 C252 C254
X00 U/D U/D U/D U U U A A A
X01 U/D R R D D D B B B
X02 U/D U/D R R R R
X03 U/D R S S S
U: Increasing A: A-phase input S: Start input
D: Decreasing B: B-phase input R: Clear input
 When high speed counters C235~C254 are in use, the inputs of the counter will be disabled for other use.
 Refer to chapter 7 Application Instructions for more details on API53 DHSCS and API54 DHSCR.