Delta AH500 series Owner's manual

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I 
Asia
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
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Americas
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 
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Europe
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AHSOO
Programming Manual
www.delta.co.tw/ia
2018-06-05

AH500 Programming Manual
Revision History
Version
Revision
Date
1st
The first version is published.
2012/11/09
2nd
1. Chapter 1: updated the model description in section 1.1.2
2. Chapter 2: updated device list in section 2.1.1, latched areas in
the device range
in section 2.1.4, strings in section 2.2.3,
special auxiliary relays in section 2.2.7, refresh time of special
data registers in section 2.2.8, special data registers in section
2.2.14, refresh time of special data registers in section 2.2.15,
additional remarks on special auxiliary relays and special data
registers in section 2.2.16.
3. Chapter 3: added new instructions of API0117, API0118,
API0708 and API1812.
4. Chapter 4: updated restrictions on the use of the instructions in
section 4.2.
5. Chapter 6: added new instructions of API0114, API0204,
API0205, API0212, API0217, API0218, API0219, API0310,
API0702, API0703, API0705, API0707, API1000, API1002,
API1003, API1004, API1301, API1510, API1516, API1701,
API1702, API1703, API1704, API1800, API1803, API1806,
API1807, API1809, API1810, API1811, API2100, API2103,
API2108, API2110, API2200, API2201, API2202, API2203,
API2204, API2205, and API2300.
6. Chapter 7: updated contents of 7.1.1, 7.1.2, 7.1.3, 7.1.4, 7.1.8,
7.1.9, and 7.1.10.
2016/08/15
3rd
1. Chapter 1: updated contents in section 1.1.1 and added
information for new models including AH15SCM-5A,
AHRTU-ETHN-5A, AH15EN-5A, AHCPU501-RS2,
AHCPU521-RS2, AHCPU531-RS2, AHCPU501-EN. Revise
the wiring model name.
2. Chapter 2: updated ASCII table in section 2.2.3 and added
information for new models including AHCPU560-EN2,
AHCPU501-RS2, AHCPU521-RS2, AHCPU531-RS2, and
AHCPU501-EN. Added and update information concerning
SM/SR in section 2.2.8, 2.2.14, 2.2.15 and 2.2.16.
3. Chapter 3: Added new API2900 and API2901 in the instruction
table and updated INV symbol in section 3.3.
4. Chapter 6: Updated the following APIs 0702, 0904, 1111,
1503-1505, 1701, 1702, 1800, 1812, 2116, 2200, 2300-2302,
2900 and 2901.
5. Chapter 7: Updated contents in section 7.1.1 and added
information for new models AH15SCM-5A and AH15EN-5A.
2018/06/05

i
AH500 Programming Manual
Contents
Chapter 1 Introduction
1.1 Overview .................................................................................................. 1-2
1.1.1 Related Manuals ............................................................................... 1-2
1.1.2 Model Description.............................................................................. 1-2
1.2 Software ..................................................................................................1-10
1.2.1 Program Editor.................................................................................1-10
1.2.2 Program Organization Units and Tasks............................................1-11
Chapter 2 Devices
2.1 Introduction of Devices............................................................................. 2-2
2.1.1 Devise List......................................................................................... 2-2
2.1.1.1AH500 Basic CPU Modules (AHCPU500/510/520/530)................... 2-2
2.1.1.2 AH500 Advanced CPU Modules (AHCPU501/511/521/531)............ 2-3
2.1.2 Basic Structure of I/O Storages......................................................... 2-4
2.1.3 Relation between the PLC Action and the Device Type .................... 2-4
2.1.4 Latched Areas in the Device Range.................................................. 2-5
2.2 Functions of Devices................................................................................ 2-6
2.2.1 Values and Constants........................................................................ 2-6
2.2.2 Floating-point Numbers..................................................................... 2-7
2.2.2.1 Single-precision Floating-point Numbers ................................... 2-7
2.2.2.2 Double-precision Floating-point Numbers.................................. 2-8
2.2.2.3 Decimal Floating-point Numbers................................................ 2-9
2.2.3 Strings ............................................................................................... 2-9
2.2.4 Input Relays .....................................................................................2-10
2.2.5 Output Relays ..................................................................................2-11
2.2.6 Auxiliary Relays................................................................................2-11
2.2.7 Special Auxiliary Relays ...................................................................2-12
2.2.8 Refresh Time of Special Auxiliary Relays .........................................2-38
2.2.9 Stepping Relays ...............................................................................2-46
2.2.10 Timers...........................................................................................2-47
2.2.11 Counters.......................................................................................2-48
2.2.12 32-bit Counters.............................................................................2-50
2.2.13 Data Registers..............................................................................2-51
2.2.14 Special Data Registers .................................................................2-52

ii
2.2.15 Refresh Time of Special Data Registers.......................................2-80
2.2.16 Additional Remarks on SpecialAuxiliary Relays and Special Data
Registers......................................................................................2-82
2.2.17 Link Registers...............................................................................2-98
2.2.18 Index Registers ............................................................................2-98
Chapter 3 Instruction Tables
3.1 Instructions ............................................................................................3-2
3.1.1 Basic Instructions...............................................................................3-2
3.1.2 Applied Instructions............................................................................3-2
3.2 Instruction Tables...................................................................................3-3
3.2.1 Basic Instructions...............................................................................3-3
3.2.2 Applied Instructions............................................................................3-4
3.2.3 Applied Instructions (Sorted Alphabetically).......................................3-5
3.2.4 Device Tables.....................................................................................3-6
3.3 Lists of Basic Instructions ......................................................................3-7
3.4 Lists of Applied Instructions...................................................................3-9
3.4.1 Applied Instructions............................................................................3-9
3.4.2 Applied Instructions (Sorted Alphabetically).....................................3-35
Chapter 4 Analog Input/Output Module
4.1 Composition of Applied Instructions........................................................4-2
4.2 Restrictions on the Use of the Instructions..............................................4-5
4.3 Index Registers.......................................................................................4-6
4.4 Pointer Registers ....................................................................................4-7
4.5 Pointer Registers of Timers.....................................................................4-9
4.6 Pointer Registers of 16-bit Counters.....................................................4-10
4.7 Pointer Registers of 32-bit Counters.....................................................4-11
Chapter 5 Basic Instructions
5.1 List of Basic Instructions ...........................................................................5-2
5.2 Basic Instructions......................................................................................5-3
Chapter 6 Applied Instructions
6.1 Comparison Instructions............................................................................6-3
6.1.1 List of Comparison Instructions.........................................................6-3
6.1.2 Explanation of Comparison Instructions............................................6-6
6.2 Arithmetic Instructions.............................................................................6-36

iii
6.2.1 List of Arithmetic Instructions...........................................................6-36
6.2.2 Explanation of Arithmetic Instructions .............................................6-37
6.3 Data Conversion Instructions...................................................................6-73
6.3.1 List of Data Conversion Instructions................................................6-73
6.3.2 Explanation of Data Conversion Instructions...................................6-74
6.4 Data Transfer Instructions......................................................................6-111
6.4.1 List of Data Transfer Instructions...................................................6-111
6.4.2 Explanation of Data Transfer Instructions......................................6-112
6.5 Jump Instructions ..................................................................................6-134
6.5.1 List of Jump Instructions ...............................................................6-134
6.5.2 Explanation of Jump Instructions ..................................................6-135
6.6 Program Execution Instructions.............................................................6-143
6.6.1 List of Program Execution Instructions..........................................6-143
6.6.2 Explanation of Program Execution Instructions.............................6-144
6.7 I/O Refreshing Instructions....................................................................6-151
6.7.1 List of I/O Refreshing Instructions.................................................6-151
6.7.2 Explanation of I/O Refreshing Instructions....................................6-152
6.8 Convenience Instructions ......................................................................6-154
6.8.1 List of Convenience Instructions ...................................................6-154
6.8.2 Explanation of Convenience Instructions......................................6-155
6.9 Logic Instructions...................................................................................6-191
6.9.1 List of Logic Instructions................................................................6-191
6.9.2 Explanation of Logic Instructions...................................................6-192
6.10 Rotation Instructions..............................................................................6-215
6.10.1 List of Rotation Instructions...........................................................6-215
6.10.2 Explanation of Rotation Instructions..............................................6-216
6.11 Basic Instructions ..................................................................................6-226
6.11.1 List of Basic Instructions ...............................................................6-226
6.11.2 Explanation of Basic Instructions ..................................................6-227
6.12 Shift Instructions....................................................................................6-234
6.12.1 List of Shift Instructions.................................................................6-234
6.12.2 Explanation of Shift Instructions....................................................6-235
6.13 Data Processing Instructions.................................................................6-260
6.13.1 List of Data Processing Instructions..............................................6-260
6.13.2 Explanation of Data Processing Instructions.................................6-261
6.14 Structure Creation Instructions ..............................................................6-307
6.14.1 List of Structure Creation Instructions ...........................................6-307
6.14.2 Explanation of Structure Creation Instructions..............................6-308

iv
6.15 Module Instructions...............................................................................6-315
6.15.1 List of Module Instructions............................................................6-315
6.15.2 Explanation of Module Instructions...............................................6-316
6.16 Floating-point Number Instructions........................................................6-321
6.16.1 List of Floating-point Number Instructions.....................................6-321
6.16.2 Explanation of Floating-point Number Instructions .......................6-322
6.17 Real-time Clock Instructions..................................................................6-362
6.17.1 List of Real-time Clock Instructions...............................................6-362
6.17.2 Explanation of Real-time Clock Instructions..................................6-363
6.18 Peripheral Instructions...........................................................................6-376
6.18.1 List of Peripheral Instructions........................................................6-376
6.18.2 Explanation of Peripheral Instructions...........................................6-377
6.19 Communication Instructions..................................................................6-391
6.19.1 List of Communication Instructions...............................................6-391
6.19.2 Explanation of Communication Instructions..................................6-392
6.20 Other Instructions..................................................................................6-428
6.20.1 List of Other Instructions...............................................................6-428
6.20.2 Explanation of Other Instructions..................................................6-429
6.21 String Processing Instructions...............................................................6-438
6.21.1 List of String Processing Instructions............................................6-438
6.21.2 Explanation of String Processing Instructions...............................6-439
6.22 Ethernet Instructions .............................................................................6-500
6.22.1 List of Ethernet Instructions..........................................................6-500
6.22.2 Explanation of Ethernet Instructions.............................................6-501
6.23 Memory Card Instructions.....................................................................6-526
6.23.1 List of Memory Card Instructions..................................................6-526
6.23.2 Explanation of Memory Card Instructions.....................................6-527
6.24 Task Control Instructions.......................................................................6-538
6.24.1 List of Task Control Instructions....................................................6-538
6.24.2 Explanation of Task Control Instructions.......................................6-539
6.25 SFC Instructions....................................................................................6-541
6.25.1 List of SFC Instructions.................................................................6-541
6.25.2 Explanation of SFC Instructions....................................................6-542
6.26 Redundant Instructions .........................................................................6-548
6.26.1 List of Redundant Instructions ......................................................6-548
6.26.2 Explanation of Redundant Instructions.........................................6-549

v
Chapter 7 Error Codes
7.1 Error Codes and LED Indicators............................................................... 7-2
7.1.1 CPU Modules.................................................................................... 7-2
7.1.2 Analog I/O Modules and Temperature Measurement Modules........7-22
7.1.3 AH02HC-5A/AH04HC-5A.................................................................7-24
7.1.4 AH05PM-5A / AH10PM-5A / AH15PM-5A ........................................7-24
7.1.5 AH20MC-5A.....................................................................................7-25
7.1.6 AH10EN-5A / AH-15EN-5A ..............................................................7-26
7.1.7 AH10SCM-5A / AH15SCM-5A..........................................................7-27
7.1.8 AH10DNET-5A.................................................................................7-27
7.1.9 AH10PFBM-5A.................................................................................7-28
7.1.10 AH10PFBS-5A................................................................................7-28
7.1.11 AH10COPM-5A...............................................................................7-29

1-1
Chapter 1 Introduction
Table of Contents
1.1 Overview .................................................................................................. 1-2
1.1.1 Related Manuals ............................................................................... 1-2
1.1.2 Model Description.............................................................................. 1-2
1.2 Software ..................................................................................................1-10
1.2.1 Program Editor.................................................................................1-10
1.2.2 Program Organization Units and Tasks............................................1-12

AH500 Programming Manual
1-2
1.1 Overview
This manual introduces the programming of the AH500 series programmable logic controllers, the
basic instructions, and the applied instructions.
1.1.1 Related Manuals
The related manuals of the AH500 series programmable logic controllers are composed of the
following.
AH500 Quick Start
It guides users to use the system before they read the related manuals.
AH500 Programming Manual
It introduces the programming of the AH500 series programmable logic controllers, the basic
instructions, and the applied instructions.
ISPSoft User Manual
It introduces the use of ISPSoft, the programming languages (ladder diagrams, instruction lists,
sequential function charts, function block diagrams, and structured texts), the concept of POUs,
and the concept of tasks.
AH500 Hardware Manual
It introduces electrical specifications, appearances, dimensions, and etc.
AH500 Operation Manual
It introduces functions of CPUs, devices, module tables, troubleshooting, and etc.
AH500 Module Manual
It introduces the use of special I/O modules. For example, network modules, analog I/O
modules, temperature measurement modules, and etc.
AH500 Motion Control Module Manual
It introduces the specifications for the motion control modules, the wiring, the instructions, and
the functions.
PMSoft User Manual
It introduces the use of PMSoft, including the editing mode, the connection, and the password
setting.
AH500 Redundancy System Operation Manual
It introduces the AH500 redundancy structures, establishments, programming designs, and
operations.
1.1.2 Model Description
Classification
Model Name
Description
Power supply
module AHPS05-5A
100~240 V AC
50/60 Hz
AHPS15-5A
24 V DC
CPU module
AHCPU500-RS2
It is a basic CPU module with two built-in RS-485 ports,
one built-in USB port, and one built-in SD interface. It
supports 768 inputs/outputs. The program capacity is 32K
steps.
AHCPU500-EN
It is a basic CPU module with one built-in Ethernet port,
one built-in RS-485 port, one built-in USB port, and one
built-in SD interface. It supports 768 inputs/outputs. The
program capacity is 32K steps.
AHCPU501-RS2
It is an advanced CPU module with two built-in RS-485
ports, one built-in USB port, and one built-in SD interface.
It supports 768 inputs/outputs. The program capacity is
48K steps.

Chapter 1 Introduction
1-3
Classification
Model Name
Description
AHCPU501-EN
It is an advanced CPU module with one built-in Ethernet
port, one built-in RS-485 port, one built-in USB port, and
one built-in SD interface. It supports 768 inputs/outputs.
The program capacity is 48K steps.
AHCPU510-RS2
It is a basic CPU module with two built-in RS-485 ports,
one built-in USB port, and one built-in SD interface. It
supports 1280 inputs/outputs. The program capacity is
64K steps.
AHCPU510-EN
It is a basic CPU module with one built-in Ethernet port,
one built-in RS-485 port, one built-in USB port, and one
built-in SD interface. It supports 1280 inputs/outputs. The
program capacity is 64K steps.
AHCPU511-RS2
It is an advanced CPU module with two built-in RS-485
ports, one built-in USB port, and one built-in SD interface.
It supports 1280 inputs/outputs. The program capacity is
96K steps.
AHCPU511-EN
It is an advanced CPU module with one built-in Ethernet
port, one built-in RS-485 port, one built-in USB port, and
one built-in SD interface. It supports 1280 inputs/outputs.
The program capacity is 96K steps.
AHCPU520-RS2
It is a basic CPU module with two built-in RS-485 ports,
one built-in USB port, and one built-in SD interface. It
supports 2304 inputs/outputs. The program capacity is
128K steps.
AHCPU520-EN
It is a basic CPU module with one built-in Ethernet port,
one built-in RS-485 port, one built-in USB port, and one
built-in SD interface. It supports 2304 inputs/outputs. The
program capacity is 128K steps.
AHCPU521-RS2
It is an advanced CPU module with two built-in RS-485
ports, one built-in USB port, and one built-in SD interface.
It supports 2304 inputs/outputs. The program capacity is
192K steps.
AHCPU521-EN
It is an advanced CPU module with one built-in Ethernet
port, one built-in RS-485 port, one built-in USB port, and
one built-in SD interface. It supports 2304 inputs/outputs.
The program capacity is 192K steps.
AHCPU530-RS2
It is a basic CPU module with two built-in RS-485 ports,
one built-in USB port, and one built-in SD interface. It
supports 4352 inputs/outputs. The program capacity is
256K steps.
AHCPU530-EN
It is a basic CPU module with one built-in Ethernet port,
one built-in RS-485 port, one built-in USB port, and one
built-in SD interface. It supports 4352 inputs/outputs. The
program capacity is 256K steps.
AHCPU531-RS2
It is an advanced CPU module with two built-in RS-485
ports, one built-in USB port, and one built-in SD interface.
It supports 4352 inputs/outputs. The program capacity is
384K steps.
AHCPU531-EN
It is an advanced CPU module with one built-in Ethernet
port, one built-in RS-485 port, one built-in USB port, and
one built-in SD interface. It supports 4352 inputs/outputs.
The program capacity is 384K steps.
AHCPU560-EN2
It is a redundant CPU module with one built-in Ethernet

AH500 Programming Manual
1-4
Classification
Model Name
Description
port, one built-in RS-485/RS-232 port, one built-in USB
port, and one built-in SD interface. It supports 65536
inputs/outputs. The program capacity is 1M steps.
Main
backplane
AHBP04M1-5A
Four-slot main backplane for a CPU/RTU rack
AHBP06M1-5A
Six-slot main backplane for a CPU/RTU rack
AHBP08M1-5A
Eight-slot main backplane for a CPU/RTU rack
AHBP12M1-5A
Twelve-slot main backplane for a CPU/RTU rack
Redundant
backplane
AHBP04MR1-5A Four-slot redundant backplane for a CPU/RTU rack
Extension
backplane
AHBP06E1-5A
Six-slot extension backplane for a CPU/RTU extension
rack
AHBP08E1-5A
Eight-slot extension backplane for a CPU/RTU extension
rack
Redundant
extension
backplane
AHBP06ER1-5A
Six-slot extension backplane with power redundancy for a
CPU/RTU redundant extension rack
AHBP08ER1-5A
Eight-slot extension backplane with power redundancy for
a CPU/RTU redundant extension rack
Digital
input/output
module
AH16AM10N-5A
24 V DC
5 mA
16 inputs
Terminal block
AH32AM10N-5A
24 V DC
5 mA
32 inputs
Terminal block
AH32AM10N-5B
24 V DC
5 mA
32 inputs
DB37 connector
AH32AM10N-5C
24 V DC
5 mA
32 inputs
Latch connector
AH64AM10N-5C
24 V DC
3.2 mA
64 inputs
Latch connector
AH16AM30N-5A
100~240 V AC
4.5 mA~9 mA (100 V, 50 Hz)
16 inputs
Terminal block
AH16AR10N-5A
24 V DC
5 mA
16 inputs
Terminal block
(I/O interrupts are supported.)
AH16AN01R-5A
240 V AC/24 V DC
2 A
16 outputs
Relay
Terminal block
AH16AN01T-5A
12~24 V DC
0.5 A
16 outputs
Sinking output

Chapter 1 Introduction
1-5
Classification
Model Name
Description
Terminal block
Digital
input/output
module
AH16AN01P-5A
12~24 V DC
0.5 A
16 outputs
Sourcing output
Terminal block
AH32AN02T-5A
12~24 V DC
0.1 A
32 outputs
Sinking output
Terminal block
AH32AN02T-5B
12~24 V DC
0.1 A
32 outputs
Sinking output
DB37 connector
AH32AN02T-5C
12~24 V DC
0.1 A
32 outputs
Sinking output
Latch connector
AH32AN02P-5A
12~24 V DC
0.1 A
32 outputs
Sourcing output
Terminal block
AH32AN02P-5B
12~24 V DC
0.1 A
32 outputs
Sourcing output
DB37 connector
AH32AN02P-5C
12~24 V DC
0.1 A
32 outputs
Sourcing output
Latch connector
AH64AN02T-5C
12~24 V DC
0.1 A
64 outputs
Sinking output
Latch connector
AH64AN02P-5C
12~24 V DC
0.1 A
64 outputs
Sourcing output
Latch connector
AH16AN01S-5A
100~240 V AC
0.5 A
16 outputs
TRIAC
Terminal block
Digital
input/output
module AH16AP11R-5A
24 V DC
5 mA
8 inputs
240 V AC/24 V DC

AH500 Programming Manual
1-6
Classification
Model Name
Description
2 A
8 outputs
Relay
Terminal block
AH16AP11T-5A
24 V DC
5 mA
8 inputs
12~24 V DC
0.5 A
8 outputs
Sinking output
Terminal block
AH16AP11P-5A
24 V DC
5 mA
8 inputs
12~24 V DC
0.5 A
8 outputs
Sourcing output
Terminal block
Analog
input/output
module
AH04AD-5A
Four-channel analog input module
Hardware resolution: 16 bits
0/1 V~5 V, -5 V~5 V, 0 V~10 V, -10 V~10 V, 0/4 mA~20
mA, and -20 mA~20 mA
Conversion time: 150 us/channel
AH08AD-5A
Eight-channel analog input module
Hardware resolution: 16 bits
0/1 V~5 V, -5 V~5 V, 0 V~10 V, -10 V~10 V, 0/4 mA~20
mA, and -20 mA~20 mA
Conversion time: 150 us/channel
AH08AD-5B
Eight-channel analog input module
Hardware resolution: 16 bits
0/1 V~5 V, -5 V~5 V, 0 V~10 V, and -10 V~10 V
Conversion time: 150 us/channel
AH08AD-5C
Eight-channel analog input module
Hardware resolution: 16 bits
0/4 mA~20 mA, and -20 mA~20 mA
Conversion time: 150 us/channel
AH04DA-5A
Four-channel analog output module
Hardware resolution: 16 bits
0/1 V~5 V, -5 V~5 V, 0 V~10 V, -10 V~10 V, and 0/4
mA~20 mA
Conversion time: 150 us/channel
AH08DA-5A
Eight-channel analog input module
Hardware resolution: 16 bits
0/1 V~5 V, -5 V~5 V, 0 V~10 V, -10 V~10 V, 0/4 mA~20
mA
Conversion time: 150 us/channel
AH08DA-5B
Eight-channel analog output module
Hardware resolution: 16 bits
0/1 V~5 V, -5 V~5 V, 0 V~10 V, and -10 V~10 V
Conversion time: 150 us/channel
AH08DA-5C
Eight-channel analog output module
Hardware resolution: 16 bits
0/4 mA~20 mA

Chapter 1 Introduction
1-7
Classification
Model Name
Description
Conversion time: 150 us/channel
Analog
input/output
module AH06XA-5A
Four-channel analog input module
Hardware resolution: 16 bits
0/1 V~5 V, -5 V~5 V, 0 V~10 V, -10 V~10 V, 0/4 mA~20
mA, and -20 mA~20 mA
Conversion time: 150 us/channel
Two-channel analog output module
Hardware resolution: 16 bits
0/1 V~5 V, -5 V~5 V, 0 V~10 V, -10 V~10 V, and 0/4
mA~20 mA
Conversion time: 150 us/channel
Temperature
measurement
module
AH04PT-5A
Four-channel four-wire/three-wire RTD
Sensor type: Pt100/Pt1000/Ni100/Ni1000 sensor, and
0~300 Ω input impedance
Resolution: 0.1°C/0.1°F (16 bits)
Four-wire conversion time: 150 ms/channel
Three-wire conversion time: 300 ms/channel
AH08PTG-5A
Eight-channel four-wire/three-wire/two-wire RTD
Sensor type: Pt100/Pt1000/Ni100/Ni1000, and 0~300 Ω
input impedance
Resolution: 0.1°C/0.1°F (16 bits)
Conversion time: 20 ms/4 channels and 200 ms/8
channels
AH04TC-5A
Four-channel thermocouple
Sensor type: J, K, R, S, T, E, N, and -150~+150 mV
Resolution: 0.1°C/0.1°F
Conversion time: 200 ms/channel
AH08TC-5A
Eight-channel thermocouple
Sensor type: J, K, R, S, T, E, N, and -150~+150 mV
Resolution: 0.1°C/0.1°F
Conversion time: 200 ms/channel
Motion control
module
AH02HC-5A
Two-channel high-speed counter module (200 kHz)
AH04HC-5A
Four-channel high-speed counter module (200 kHz)
AH05PM-5A
Two-axis pulse train motion control module (1 MHz)
AH10PM-5A
Six-axis pulse train motion control module
(Four axes: 1 MHz; Two axes: 200 kHz)
AH15PM-5A
Four-axis pulse train motion control module (1 MHz )
AH20MC-5A
Twelve-axis DMCNET (Delta Motion Control Network)
motion control module (10 Mbps)
Network
module
AH10EN-5A
It is an Ethernet communication module. It can function as
a mater or a slave. It is equipped with two Ethernet ports,
and supports a Modbus TCP master and EtherNet/IP
(V2.0).
AH15EN-5A
It is an Ethernet communication module. It can function as
a mater or a slave. It is equipped with two Ethernet ports,
and supports a Modbus TCP master and
IEC60870-5-104.
AH10SCM-5A
It is a serial communication module with two
RS-485/RS-422 ports, and supports Modbus and UD Link
protocols.
One part of communication is isolated from the other part
of the communication, and one part of power is isolated
from the other part of the power.
AH15SCM-5A
It is a serial communication module with two RS-232
ports, and supports Modbus and UD Link protocols.

AH500 Programming Manual
1-8
Classification
Model Name
Description
One part of communication is isolated from the other part
of the communication, and one part of power is isolated
from the other part of the power.
AH10DNET-5A
It is a DeviceNet communication module. It can function
as a master or a slave. The maximum communication
speed is 1 Mbps.
AH10PFBM-5A
PROFIBUS-DP master module
AH10PFBS-5A
PROFIBUS-DP slave module
AH10COPM-5A
It is a CANopen communication module. It can function as
a master or a slave.
Remote I/O
module
AHRTU-DNET-5A
DeviceNet remote I/O module
AHRTU-PFBS-5A
PROFIBUS-DP remote I/O module
AHRTU-ETHN-5A
Ethernet remote I/O module
Extension
cable
AHACAB06-5A
0.6 meter extension cable for connecting an extension
backplane
AHACAB10-5A
1.0 meter extension cable for connecting an extension
backplane
AHACAB15-5A
1.5 meter extension cable for connecting an extension
backplane
AHACAB30-5A
3.0 meter extension cable for connecting an extension
backplane
AHAADP01EF-5A/
AHAADP02EF-5A
Fiber optics modules for extension backplanes
I/O extension
cable
UC-ET010-24A
1.0 meter I/O extension cable (latch connector) for
AH32AM10N-5C and AH64AM10N-5C
UC-ET010-24C
1.0 meter I/O extension cable (latch connector) for
AH32AN02T-5C, AH32AN02P-5C, AH64AN02T-5C and
AH64AN02P-5C
UC-ET010-33B
1.0 meter I/O extension cable (DB37 connector) for
AH32AM10N-5B, AH32AN02T-5B, and AH32AN02P-5B
UC-ET010-13B
1.0 meter I/O extension cable for AH04HC-5A and
AH20MC-5A
UC-ET010-15B
1.0 meter I/O extension cable for AH10PM-5Aand
AH15PM-5A
External
terminal
module
UB-10-ID32A
I/O external terminal module for AH32AM10N-5C and
AH64AM10N-5C
32 inputs
UB-10-OR16A
I/O external terminal module for AH32AN02T-5C and
AH64AN02T-5C
16 relay outputs
UB-10-OR16B
I/O external terminal module for AH32AN02P-5C and
AH64AN02P-5C
16 relay outputs
UB-10-ID32B
I/O external terminal module for AH32AM10N-5B
32 inputs
UB-10-OR32A
I/O external terminal module for AH32AN02T-5B
32 relay outputs
UB-10-OR32B
I/O external terminal module for AH32AN02P-5B
32 relay outputs
UB-10-OT32A
I/O external terminal module for AH32AN02T-5C,
AH32AN02P-5C, AH64AN02T-5C, and AH64AN02P-5C
32 transistor outputs
UB-10-OT32B
I/O external terminal module for AH32AN02T-5B and
AH32AN02P-5B
32 transistor outputs

Chapter 1 Introduction
1-9
Classification
Model Name
Description
UB-10-IO16C
I/O external terminal module for AH04HC-5A and
AH20MC-5A
UB-10-IO24C
I/O external terminal module for AH10PM-5A
UB-10-IO34C
I/O external terminal module for AH15PM-5A
Space module
AHASP01-5A
Space module used for an empty I/O slot

AH500 Programming Manual
1-10
1.2 Software
1.2.1 Program Editor
The outline of program editor ISPSoft:
There are five types of programming languages, including the instruction list, the structure text,
the ladder diagram, the sequential function chart, and the function block diagram.
The use of variables which allows the user to define the variable symbol to replace the device
name of the PLC not only enhances the readability of the program, but also saves the user a lot
of time to allocate the address of the device.

Chapter 1 Introduction
1-11
The introduction of the POU (Program Organization Unit) framework not only divides the main
program into several program units, but also replaces the traditional subroutines with functions
and function blocks. The framework of the program becomes more modular, and is easier to be
managed.
The concept of tasks which is used to manage the execution order of the programs advances
the program development to the level of project management. The large-scale program
development becomes easier to be managed.

AH500 Programming Manual
1-12
1.2.2 Program Organization Units and Tasks
The POUs (Program Organization Units) are the basic elements which constitute the PLC program.
Differing from the traditional PLC program, the character of the program framework introduced by
IEC 61131-3 lies in the fact that the large program is divided into several small units. These small
units are called POUs. The POUs can be classified into three types.
1. Program (PROG): The POU of the program type plays the role of the primary program in the
PLC program. The designer can define the execution of the POU of the program type as the
cyclic scan or the interrupt, and arrange the scan order in the task list for the POUs of the
program type.
2. Function block (FB): The meaning of the function block (FB) in itself is similar to the subroutine.
The program defined within the function block is executed after the function block is called by
the POU of the program type and the related parameters are entered.
3. Function (FC): The meaning of the function (FC) in itself is close to the macro instruction. That
is, users can write many operation instructions or functions into the function POU, and then
call them into use in the POU of the program type or the function block.
The task is a function which stipulates that programs are executed in certain order or according to
certain interrupt condition. The meaning of the task lies in the fact that it provides each POU of the
program type with a specific execution task, and specifies the execution order for the POUs of the
program type or the way to enable them.
Basically, not all of the POUs of the program type in a project will take part in the practical execution.
Whether to execute the POU of the program type or not, and how to execute it depend on the
assignment of the task. If the POU of the program type is not assigned the task, it will be saved as
an ordinary source code with the project instead of being compiled as an execution code of the PLC.
In addition, only the POU of the program type needs to be assigned the task. The execution of the
function blocks or functions depends on the superior POU of the program type which calls them.
There are three types of tasks.
1. Cyclic task: The POUs of the program type assigned to the cyclic task will be scanned
cyclically, and executed in order.
2. Timed interrupt task: If the time of interrupting is reached, all POUs of the program type
assigned to the timed interrupt task will be executed in order.
3. Conditional interrupt task: Conditional Interrupts can be divided into several types. For
example, the external interrupts, the I/O interrupts, and etc. Users have to make sure of the
interrupts supported by the PLC before they create a project. If the POU of the program type is
assigned to the conditional interrupt task, the function of the POU of the program type is similar
to the interrupt subroutine. If the interrupt condition is satisfied, e.g. the contact of the external
interrupt is triggered, all POUs of the program type assigned to the task will be executed in
order.

2-1
Chapter 2 Devices
Table of Contents
2.1 Introduction of Devices............................................................................. 2-2
2.1.1 Devise List......................................................................................... 2-2
2.1.1.1 AH500 Basic CPU Modules (AHCPU500/510/520/530)................... 2-2
2.1.1.2 AH500 Advanced CPU Modules (AHCPU501/511/521/531) ........... 2-3
2.1.2 Basic Structure of I/O Storages......................................................... 2-4
2.1.3 Relation between the PLC Action and the Device Type.................... 2-4
2.1.4 Latched Areas in the Device Range.................................................. 2-5
2.2 Functions of Devices................................................................................ 2-6
2.2.1 Values and Constants....................................................................... 2-6
2.2.2 Floating-point Numbers..................................................................... 2-7
2.2.2.1 Single-precision Floating-point Numbers ................................... 2-7
2.2.2.2 Double-precision Floating-point Numbers.................................. 2-8
2.2.2.3 Decimal Floating-point Numbers................................................ 2-9
2.2.3 Strings............................................................................................... 2-9
2.2.4 Input Relays .....................................................................................2-10
2.2.5 Output Relays ..................................................................................2-11
2.2.6 Auxiliary Relays................................................................................2-11
2.2.7 Special Auxiliary Relays...................................................................2-12
2.2.8 Refresh Time of Special Auxiliary Relays.........................................2-38
2.2.9 Stepping Relays...............................................................................2-46
2.2.10 Timers...........................................................................................2-47
2.2.11 Counters.......................................................................................2-48
2.2.12 32-bit Counters.............................................................................2-50
2.2.13 Data Registers..............................................................................2-51
2.2.14 Special Data Registers.................................................................2-52
2.2.15 Refresh Time of Special Data Registers.......................................2-80
2.2.16 Additional Remarks on Special Auxiliary Relays and Special Data
Registers.......................................................................................2-82
2.2.17 Link Registers...............................................................................2-98
2.2.18 Index Registers.............................................................................2-98