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Detailed memory map of OMRON PLC controller
Source: plcer.com  Date: 2011-10-11

Note:
1. IR and LR bits, when not used to their purpose, may be used as working bits.
2. Contents of HR area, LR area, counter and DM area for reading/writing is stored within backup condenser. On 25C, condenser keeps the memory contents for up to 20 days.
3. When accessing the current value of PV, TC numbers used for data have the form of word. When accessing the Completing flags, they are used as data bits. 4. Data from DM6144 to DM6655 must not be changed from within the program, but can be changed by peripheral device.

B.2. SR memory area

IR area doesn’t have predefined memory locations, but is meant for general use in the program. Of all the locations this memory area consists of, only those directly connected to PLC controller input/output lines are of interest for this appendix.

IR area can be divided into 3 parts:

1. Input area is located from word IR000 to IR009, totaling 160 bits. Most important of these are in the word IR000 because they are directly connected to screw terminal of PLC controller. Input IR000.01 is directly connected to screw terminal marked with 01 on the casing of the PLC controller.

2. Output area is located from word IR010 to IR019, totaling 160 bits. Most important of these are in the word IR010 because they are directly connected to screw terminal of PLC controller. Output IR000.00 is directly connected to screw terminal marked with 00 on the casing of the PLC controller.

3. Working area is located from word IR200 to IR231 totaling 512 bits for general use.

As IR memory area does not have predefined memory locations, more detailed explanations are not necessary.

 

B.3. IR memory area

Unlike IR area, SR area does have predefined memory locations. These bits are usually tied to the PLC controller work or contain current and set values of different functions. Purpose of specific memory locations of SR area is explained in the following table:

 

Introduction

Purpose of this appendix is to explain certain memory areas in detail. As the following tables cover whole memory, there are options left unused in this book. They should be skipped during the first reading, and used later according to needs.

B.1 General explanation of memory areas

Memory of PLC controller consists of several areas, some of these having predefined functions.

 

Data area Word(s) Bit(s) Function
IR area input area IR 000 - IR 009 (10 words) IR 00000 - IR 00915 (160 bits) These bits may be assigned to an external I/O connection. Some of these have direct output on screw terminal (for example, IR000.00 - IR000.05 and IR010.00 - IR010.03 with CPM1A model)
output area IR 010 - IR 019 (10 words) IR 01000 - IR 01915 (160 bits)
working area IR 200 - IR 231 (32 words) IR 20000 - IR 23115 (512 bits) Working bits that can be used freely in the program. They are commonly used as swap bits
SR area SR 232 - SR 255 (24 words) SR23200 - SR25515 (384 bits) Special functions, such as flags and control bits
TR area --- TR 0 - TR 7 (8 bits) Temporary storage of ON/OFF states when jump takes place
HR area HR 00 - HR 19 (20 words) HR0000 - HR1915 (320 bits) Data storage; these keep their states when power is off
AR area AR 00 - AR 15 (16 words) AR0000 - AR1515 (256 bits) Special functions, such as flags and control bits
LR area LR 00 - LR 15 (16 words) LR0000 - LR1515 (256 bits) 1:1 connection with another PC
Timer/counter area TC 000 - TC 127 (timer/counter numbers) Same numbers are used for both timers and counters
DM area Read/write DM 0000 - DM 0999 and DM 1022 - DM 1023 (1002 words) --- Data of DM area may be accessed only in word form. Words keep their contents after the power is off
Error writing DM 1000 - DM 1021 (22 words) --- Part of the memory for storing the time and code of error that occurred. When not used for this purpose, they can be used as regular DM words for reading and writing. They cannot be changed from within the program
Read only DM 6144 - DM 6599 (456 words) ---
PC setup DM 6600 - DM 6655 (56 words) ---

 

Storing various parameters for controlling the PC

 

Words Bits Function
SR 232 - SR 235 00 - 15 Input area for macro functions. Contains input operands for MCRO(99) (may be used for working bits, when MCRO(99) is not used)
SR 236 - SR 239 00 - 15 Output area for macro functions. Contains output operands for MCRO(99) (may be used for working bits, when MCRO(99) is not used)
SR 240 00 - 15 Contains set value SV, when input interrupt 0 is used in counter mode (4 hexadecimal digits) (may be used for working bits, when input interrupt 0 is not used in counter mode)
SR 241 00 - 15 Contains set value SV, when input interrupt 1 is used in counter mode (4 hexadecimal digits) (may be used for working bits, when input interrupt 1 is not used in counter mode)
SR 242 00 - 15 Contains set value SV, when input interrupt 2 is used in counter mode (4 hexadecimal digits) (may be used for working bits, when input interrupt 2 is not used in counter mode)
SR 243 00 - 15 Contains set value SV, when input interrupt 3 is used in counter mode (4 hexadecimal digits) (may be used for working bits, when input interrupt 3 is not used in counter mode)
SR 244 00 - 15 Contains current value (PV-1), when input interrupt 0 is used in counter mode (4 hexadecimal digits)
SR 245 00 - 15 Contains current value (PV-1), when input interrupt 1 is used in counter mode (4 hexadecimal digits)
SR 246 00 - 15 Contains current value (PV-1), when input interrupt 2 is used in counter mode (4 hexadecimal digits)
SR 247 00 - 15 Contains current value (PV-1), when input interrupt 3 is used in counter mode (4 hexadecimal digits)
SR 248, SR 249 00 - 15 Contains current value PV of the high-speed counter (may be used for working bits, when high-speed counter is not used)
SR 250 00 - 15 Analog setting of value 0. Keeps 4 digit BCD value (0000 - 0200) set via analog potentiometer on the PLC controller casing.
SR 251 00 - 15 Analog setting of value 1. Keeps 4 digit BCD value (0000 - 0200) set via analog potentiometer on the PLC controller casing.
SR 252 00 Reset of the high-speed counter
  01 - 07 Not used
  08 Peripheral port. Switches on for the reset of the peripheral port (this doesn't apply to a case when peripheral device is connected). Bit automatically changes state to OFF after the reset
  09 Not used
  10 PLC Setup Reset Bit. When on, it initializes PC setup (DM6600-DM6655). It automatically goes to OFF after the reset. This applies only if the PC is in PROGRAM mode
  11 Forced Status Hold Bit. OFF: bits used in the operation of forced set/reset are cleared when changing from PROGRAM to MONITOR mode. ON: bits used in the operation of forced set/reset keep their states when changing from PROGRAM to MONITOR mode.
  12  I/O Hold bit. OFF: IR and LR bits are reset when starting or ending an operation. ON: IR and LR bits keep their states when starting or ending an operation.
  13 Not used
  14 Error Log Reset Bit. Bit state OFF clears the record of error taking place. Bit automatically goes off after the operation
  15 Not used
SR 253 00 - 07 FAL error code. Location contains error code (2 digit number). FAL number is stored at this location upon executing FAL(06) or FAL(07) instructions. Location contents are reset upon executing FAL 00 instruction or by clearing an error from peripheral device
  08 Not used
  09 Cycle Time Overrun Flag. Bit goes to ON when program length doesn't allow cycle of input/output scanning to be executed in a specified time period
  10 - 12 Not used
  13 Flag always on
  14 Flag always off
  15 First Cycle Flag. Goes ON during the first cycle at the beginning of the operation
SR 254 00 1 min clock impulse (30s on, 30s off)
  01 0.02s clock impulse (0.01s on, 0.01s off)
  02 Negative (N) flag
  03 - 05 Not used
  06 Differential Monitor Flag
  07 STEP(8) execution flag
  08 - 15 Not used
SR 255 00 0.1s clock impulse (0.05s on, 0.05s off)
  01 0.2s clock impulse (0.1s on, 0.1s off)
  02 1.0s clock impulse (0.5s on, 0.5s off)
  03 Instruction Execution Error (ER) Flag. Changes state to ON if error occurs during instruction execution
  04 Carry (CY) flag
  05 "Greater than" (GR) flag
  06 "Equals" (EQ) flag
  07 "Less than" (LE) flag
  08 - 15 Not used

 

B.4. AR memory area

Purpose of this memory area is to provide information on PLC controller state, malfunctions and some system data. Memory locations of this area keep their states after the power has been shut down.

 

Word(s) Bit(s) Function
AR00 and AR01 00 - 15 Not used
AR02 00 Status flag of the first I/O unit for expanding I/O lines (I/O units status flag)
  01 Status flag of the second I/O unit for expanding I/O lines (I/O units status flag)
  02 Status flag of the third I/O unit for expanding I/O lines (I/O units status flag)
  03 - 07 Not used
  12 - 15 Number of connected I/O units
AR03 - AR07 00 - 15 Not used
AR08 00 - 07 Not used
  08 - 11 Peripheral device error code
  12 Flag of peripheral device error
  13 Peripheral Device Transmission Enabled Flag
  14 - 15 Not used
AR09 00 - 15 Not used
AR10 00 - 15 Power-off counter. Contains 4-digit BCD value
AR11 00 - 07 High-speed Counter Range Comparison Flags
  08 - 14 Not used
  15 Pulse Output Status. ON: stopped; OFF: Impulse at output
AR12 00 - 15 Not used
AR13 00 Power-up PC Setup Error Flag. Goes ON when error occurs in area DM 6600 - DM 6614
  01 Start-up PC Setup Error Flag. Goes ON when error occurs in area DM 6615 - DM 6644
  02 RUN PC Setup Error Flag. Goes ON when error occurs in area DM 6645 - DM 6655
  03 - 04 Not used
  05 Long Cycle Time Flag. Goes ON if real cycle length exceeds length set in DM 6619
  06 - 07 Not used
  08 Memory Area Specification Error Flag. Goes ON when non-existing address is specified in the program
  09 Flash Memory Error Flag
  10 Read-only DM Error Flag. Goes ON when checksum error occurs in DM 6144 - DM 6599 range
  11 PC Setup Error Flag. Goes ON when checksum error occurs in PC Setup area
  12 Program Error Flag. Goes ON when checksum error occurs in program memory (UM) or inappropriate instruction is executed
  13 Expansion Instruction Error Flag
  14 - 15 Not used
AR14 00 - 15 Maximum Cycle Time. 4 BCD digits. Cleared at the beginning of the operation
AR15 00 - 15 Current Cycle Time. 4 BCD digits. Not cleared when the operation ends

 Note:
1. IR and LR bits when not used for their function may be used as working bits.
2. Contents of HR area, LR area, counter, and DM area for reading/writing are kept by battery of central processing unit. In case that the battery is removed or malfunction occurs, this data will be lost.
3. When accessing the current value of PV, TC numbers used for data have form of word. When accessing Completing flags, they are used as data bits.
4. Data stored from DM6144 to DM6655 cannot be changed from within the program, but can be changed by peripheral device.
5. Program and data from DM 6144 to DM 6655 are stored in the flash memory.
 

B.5. PC memory area

PLC setup area can be roughly divided into 4 categories:

1. Settings related to basic operations of PLC controller and I/O processes
2. Settings related to cycle duration
3. Settings related to interrupts
4. Settings related to communication.

 

Word(s) Bit(s) Function
Settings are active only upon resetting the PLC and sending data from PC to PLC
DM 6600 00 - 07 Startup Mode. Active only if bits 08 - 15 are set to 02. 00: PROGRAM; 01: MONITOR; 02: RUN
  08 - 15 Startup mode designation. 00: programming console switch; 01: proceeds in the mode last used before turning off the power; 02: settings in 00 - 07
DM 6601 00 - 07 Not used (set to 0)
  08 - 11 IOM Hold Bit (SR 25212). 0: Reset; 1: Keeps the state
  12 - 15 Forced Status Hold Bit (SR 25211). 0: Reset; 1: Keeps the state
DM 6602 00 - 03 Writing to program memory protection. 00: OFF; 01: ON (except for DM 6602)
  04 - 07 Programming console display language. 00: English; 01: Japanese
  08 - 11 Not used
DM 6603 00 - 15 Not used
DM 6604 00 - 07 00: in case of battery malfunction, error will not be generated; 01: in case of battery malfunction, error will be generated
  08 - 15 Not used
DM 6605 - DM 6614 00 - 15 Not used
Cycle Time Settings (DM 6615 - DM 6619) take effect after the transfer to PC area, next time you start working
DM 6615 - DM 6616 00 - 15 Not used
DM 6617 00 - 07 Servicing time for peripheral port. Active when bits 08 - 15 are set to 01. It is expressed in percentage of cycle time duration (00 to 99 (BCD))
  08 - 15 Peripheral port servicing setting enable. 00: 5% of cycle duration; 01: time defined in first half of the word
DM 6618 00 - 07 Cycle monitor time. Settings are identical to those of the second half of the previous word
  08 - 15 Cycle monitor enable (Setting in 00 to 07 x unit; 99 5 max). 00:120ms (settings in bits 00-07 are disabled) ; 01: setting unit 10ms; 02: setting unit 100ms; 03: setting unit 1s
DM 6619 00 - 15 Cycle time. 0000: variable (no minimum); 0001: up to 9999 (BCD). Minimal time is expressed in ms
Interrupt Processing (DM 6620 - DM 6639) take effect after the transfer to PC area, next time you start working
DM 6620 00 - 03 Input constant for IR  00000 - IR 00002. 0: 0.8ms; 1: 1ms; 2: 2ms; 3: 4ms; 4: 8ms; 5: 16ms; 6: 32ms; 7: 64ms; 8: 128ms 
  04 - 07 Input constant for IR  00003 and IR 00004. Settings are same as with bits 00-03
  08 - 11 Input constant for IR  00005 and IR 00006. Settings are same as with bits 00-03
  12 - 15 Input constant for IR  00007 and IR 00011. Settings are same as with bits 00-03
DM 6621 00 - 07 Input constant for IR  001. 0: 0.8ms; 1: 1ms; 2: 2ms; 3: 4ms; 4: 8ms; 5: 16ms; 6: 32ms; 7: 64ms; 8: 128ms
  08 - 15 Input constant for IR  002. Settings are same as with IR 001
DM 6622 00 - 07 Input constant for IR  003. Settings are same as with IR 001
  08 - 15 Input constant for IR  004. Settings are same as with IR 001
DM 6623 00 - 07 Input constant for IR  005. Settings are same as with IR 001
  08 - 15 Input constant for IR  006. Settings are same as with IR 001
DM 6624 00 - 07 Input constant for IR  007. Settings are same as with IR 001
DM 6625 00 - 07 Input constant for IR  008. Settings are same as with IR 001
  08 - 15 Input constant for IR  009. Settings are same as with IR 001
DM 6626 - DM 6627 00 - 15 Not used
DM 6628 00 - 03 Interrupt enabled on IR 00000. (0: regular input; 1: interrupt input; 2: fast-reaction input)
  04 - 07 Interrupt enabled on IR 00001. (0: regular input; 1: interrupt input; 2: fast-reaction input)
  08 - 11 Interrupt enabled on IR 00002. (0: regular input; 1: interrupt input; 2: fast-reaction input)
  12 - 15 Interrupt enabled on IR 00003. (0: regular input; 1: interrupt input; 2: fast-reaction input)
High-speed counter settings (DM 6640-DM 6644) take effect after the transfer to PC area, next time you start working
DM 6640 - DM 6641 00 - 15 Not used
DM 6642 00 - 03 High-speed counter mode. 0: counting up/down; 4: incremental mode
  04 - 07 High-speed counter reset mode. 0: Z phase and software reset; 1: software reset only 
  08 - 15 High-speed counter enable. 0: high-speed counter not used; 1: high-speed counter used with settings 00-07
DM 6643 - DM 6644 00 - 15 Not used
 Peripheral port settings take effect after the transfer to PC area
DM 6645 - DM 6649 00 - 15 Not used
DM 6650 00 - 07 Port settings. 00: standard (1 start bit, even parity, 2 stop bits, 9600bps); 01: Settings in DM 6651 (settings other than this cause error and turn on AR 1302)
  08 - 11 Area for 1:1 connection with a PC via peripheral port. 0: LR00-LR15
  12 - 15 Modes of communication. 0: Host link; 2: one-to-one PC link (slave); 3: one-to-one PC link (master); 4: NT link (settings other than this cause error and turn on AR 1302)
DM 6651 00 - 07 Baud rate. 00: 1200 bps; 01: 2400 bps; 02: 4800 bps; 03: 9600 bps; 04: 19200 bps
  08 - 15 Frame format (Start bits/Data bits/Stop bits/Parity).      00:1/7/1/even; 01:1/7/1/odd; 02:1/7/1/none; 03:1/7/2/even; 04:1/7/2/odd; 05:1/7/2/none; 06:1/7/1/even; 07:1/7/1/odd; 08:1/7/1/none; 09:1/7/2/even; 10:1/7/2/odd; 11:1/7/2/none          (settings other than this cause error and turn on AR 1302)   
DM 6652 00 - 15 Host Link Transmission Delay (0000 - 9999ms)                      (settings other than this cause error and turn on AR 1302)
DM 6653 00 - 07 Host Link (00 - 31 BCD)                                                        (settings other than this cause error and turn on AR 1302)
  08 - 15 Not used
DM 6654 00 - 15 Not used
Error logsettings (DM 6655) take effect after the transfer to PLC controller
DM 6655 00 - 03 Style. 0: move after 7 records; 1: keep only first 7 (no moving);   2-F: no records
  04 - 07 Not used
  08 - 11 Cycle Time monitor Enable. 0: detect long cycles as non-fatal errors; 1: do not detect long cycles
  12 - 15 Not used

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