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What Is A Substitute Product For Old H7ET Time Counters?
1. It depends on H7ET model. Refer to the following table.
| Display |
LCD (character height: 6.7 mm) |
| Operating mode |
Incremental type |
| Mounting method |
Flush mounting |
Direct
mounting
on PC board |
| Count input |
No-voltage input |
DC voltage input |
Multi-voltage |
No-voltage
input |
| Reset method |
External |
External/Manual |
External |
External/Manual |
External |
External,
Power-OFF |
| Number of digits |
7 |
6 |
7 |
6 |
7 |
7 |
External
connections |
Screw
terminals |
H7ET-B
H7ET-B1
H7ET-B2
H7ET-B3 |
H7ET-BM |
H7ET-BV
H7ET-BV1
H7ET-BV2
H7ET-BV3 |
H7ET-BVM |
H7ET-FBV
H7ET-FBV1
H7ET-FBV2
H7ET-FBV3 |
--- |
Wire-wrap
terminals |
H7ET |
H7ET-M |
H7ET-V |
H7ET-VM |
--- |
--- |
DIP
terminals |
--- |
--- |
--- |
H7ET-P |
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(1)
H7ET-N
H7ET-N1 |
(2)
H7ET-NV
H7ET-NV1 |
(3)
H7ET-NFV
H7ET-NFV1 |
(4)
H7ET-NP |
Note:
1.Discontinued models with no number indicate that the time is displayed in hours. Models with the suffix "1" indicate that the time is displayed in hours, minutes, and seconds. The suffix "2" indicates hours and minutes, and the suffix "3" indicates days and hours.
2.The bottom row gives recommended substitute products or models with substitute functions. For details, see the following information.
2.If H7ET-B1 or H7ET-B2 was used, the substitute product is H7ET-N1 with time display units switchable between h/min/s and h/min. If other models were used, the substitute product is H7ET-N with time display units switchable between h and day/h. (See column (1).)
If a wire-wrap terminal was used, Y92S-37 Wire-wrap Terminals (two in one set) must be separately purchased and attached to the terminal block.
If manual reset is not used, the key-protect switch must be set to ON.
The time display unit must be set using the time-range switch.
3.If H7ET-BV1 or H7ET-BV2 was used, the substitute product is H7ET-NV1 with time display units switchable between h/min/s and h/min. If other models were used, the substitute product is the H7ET-NV with time display units switchable between h and day/h. (See column (2).)
If a wire-wrap terminal was used, Y92S-37 Wire-wrap Terminals (two in one set) must be separately purchased and attached to the terminal block.
If manual reset is not used, the key-protect switch must be set to ON.
The time display unit must be set using the time-range switch.
4.If the H7ET-FBV1 or H7ET-FBV2 was used, the substitute product is H7ET-NFV1 with time display units switchable between h/min/s and h/min. If other models were used, the substitute product is H7ET-NFV with time display units switchable between h and day/h. (See column (3).)
If the high level was 6 to 24 VDC, H7ET-NV or H7ET-NV1 with DC voltage input must be used because if the DC high level of H7ET-FBV with multi-voltage input was 6 to 240 VDC, it becomes 24 to 240 VDC for H7EC-NFV.
If manual reset is not used, the key-protect switch must be set to ON.
The time display unit must be set using the time-range switch.
5.The substitute product in column (4) is H7ET-NP.
6.General Comparison of H7ET and H7ET-N
| Compared item |
H7ET |
H7ET-N |
Remarks |
Number of
digits |
6/7 |
7 |
|
Character
height |
6.7 mm |
8.6 mm |
|
Time display
Unit Model
number |
None: Hour
1: Hour/Minute/Second
2: Hour/Minute
3: Day/Hour |
None: Switchable between Hour and Day/Hour
1: Switchable between Hour/Minute/Second and Hour/Minute
PCB mounting models: Hour display only |
|
Input signal
level |
DC voltage input
High level: 4.5 to 30 VDC
Low level: 0 to 2 VDC
Multi-voltage input
High level: 24 to 240 VAC/6 to 240 VDC
Low level: 0 to 1.5 VAC/0 to 2 VDC |
DC voltage input
High level: 4.5 to 30 VDC
Low level: 0 to 2 VDC
Multi-voltage input
High level: 24 to 240 VAC/VDC
Low level: 0 to 2.4 VAC/VDC |
See
note 1 |
| Reset system |
Non-PCB mounting model: Reset - Glossary of Industrial Automation">External reset only, external/manual reset
PCB mounting model: Power-OFF reset: 100 ms min. |
Non-PCB mounting model: External/Manual Reset
(manual Reset system has key-protect switching)
PCB mounting model: Power-OFF reset: 500 ms min. |
See
note 2 |
Battery
replacement |
Not possible |
Possible (Externally mounted for PCB mounting models) |
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Note:
1.The high level 6 to 24 VDC of H7ET-N is cut, so choose a DC voltage input model.
2.Be careful when using the power-OFF reset.
Link:
http://www.myomron.com/index.php?action=kb&print=955
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