Samsung Ht As700 User Manual

51 BCD (Binary Coded Decimal)
BCD is used to express a decimal digit (0 to 9) using 4 bits. Conversion 
of BCD values can be done in hexadecimal calculations.
Flash ROM 
It refers to a ROM (EEPROM) that stores programs. Since its contents 
can be deleted periodically, it is frequently used for equipments that 
deals with programs such as a PLC.
How to use a register 
 R (Relay) register (Can be bit, word or double word)
Indicates the external I/O register that directly connects to the 
general I/O...

52 For bit operations, such as setting, resetting, shifting, or rotating
Use the M, K, and R area. You cannot perform bit operations in the 
W area.
 When you want to refer to or modify the set value of the timer or 
counter.
Refer to or modify W2048 to W2303 or SV0 to SV255.
 When you want to refer to or modify the present value of the 
timer or counter.
Refer to or modify the address area from W2304 to W2559 or from 
PV0 to PV255. The value holds true in STOP (PROG.) state in this 
area. 
The...

53
 Allowed Functions in Operation Modes
 5=On,  ◑=Flashing, 
●=Off
When the PROG.LED is on, you can change the user program.
The INITIALIZE switch clears errors when the mode switch is set to 
PROG. 
When the mode switch is set to REMOTE and power is switched from 
Off to On, the previous mode of operation is restored.
When debugging the user program, the mode switch should be set to 
REMOTE.
Processor Processing Procedure 
Program processing procedure
 Program analysis
Executes the program from its...

54 Watchdog time initialization
The watchdog elapsed time value is set to 0. (This value is the 
watchdog calculation point until the next scan.)
The following illustration shows the difference between the relay 
board and PLC sequence processing. The relay carries out all 
sequences simultaneously while the PLC processes sequentially 
throughout the program.
Processing of relay sequence
(Parallel process)Processing of PLC program
(Serial process)
 

55
4
Installation and Wiring
Installation
Installation space and environment
External dimensions (mm)
unit (mm)
 3-slot type5-slot type8-slot type10-slot type12-slot type
A (mm) 205.0 276.0 381.0 452.0 522.0
B (mm) 183.8 254.2 359.8 430.2 500.6
 

56
Installation location 
Be sure to maintain a sufficient distance from wiring ducts, and other 
machines below and above the module for proper ventilation. 
Do not install the modules stacked up or horizontally. Doing so will 
prevent proper cooling of the module and cause overheating inside 
the PLC (programmable controller). 
Do not install the module above devices which generate heat such as 
heaters, transistors or large scale resistors. 
In order to eliminate any effects from noise emission, power...

57
Avoid installing the module in the following conditions
 Ambient temperature outside the range of 0 to 55 °C 
 Ambient humidity outside the range of 30 to 85% RH 
 Sudden temperature changes causing condensation 
 Inflammable or corrosive gases
 Excessive airborne dust, metal particles, salinity
 Benzene, thinner, alcohol, other organic solvents or strong alkaline solutions such as 
ammonia or caustic soda
 Excessive vibration or shock
 Direct sunlight 
 Location near high-tension wires,...

58
NIt is recommended that you use crimped terminal for wiring. 
Use 2mm2 twisted pair cable or larger
 Use power supply wire that is thicker than 2mm2 to minimize voltage drops.
 Use twisted pair cable to minimize noise effects.
Proper compressed connection terminal
 Circular type terminal (O type Lug)
 Circular type terminal with insulation resistance
 Open type terminal (Y type Lug)
Power supply system
Use separate wiring systems for the PLC module, I/O module, and 
power supply module as shown...

59
Grounding
Ground the PLC for noisy environments 
 Connected to the metal part of backplane, the frame ground terminal is connected to a solid 
earth ground.
 Use ground wires with a minimum of 2mm
2 and the triple grounding connection which has 
a resistance of less than 100 Ω.
 The point of grounding should be as close to the PLC as possible and the ground wire 
should be as short as possible.
 If two devices share a single ground point, it may produce an adverse effect. Always use an 
exclusive...

60
Input and Output Wiring
Input wiring
Checkpoints for input module wiring 
There can be limits on the number of points that can be 
simultaneously turned on, based on the module type.
Check such limits in the specifications of each input module. In 
particular, be careful when using in high ambient temperature.
The connection method for each type of input device including sensor 
is described below. 
Photoelectric sensors and proximity sensors 
Relay output type 2 wired type 
Internal CircuitInput...