One possible cause is that common FB _C_COM is not registered with the library. For communication-related expansion FBs

The SX-Programmer Expert supports MODBUS communication (master function) using an FB. Communication with a MODBUS slave

In the system definition, group-type slave stations in any I/O configuration are registered as 'DeviceNet capsule.' In a

RS-485 is upper compatible with RS-422. In general, RS-422 devices mainly use 4-wire connection method, while RS-485 dev

The following are necessary. 1) Hardware: General-purpose communication module (NP1L-RS1/RS2/RS3/RS4/RS5) whose fi

Set the port No. as described below. (1) For NP1L-RS2_ Set '0.' (2) For NP1L-RS4_ Set '1.' See the figure below for th

Once an error history is generated, it is retained internally within the FL-net module and is cleared when the power is

We recommend you use an unmanaged switch, without B.S protection that is an industrial hub fulfilling the conditions of

When the common memory system is used, this can be achieved by handshaking with an application using part of the link me

Yes, you can use NP1L-RS1/RS4/RS5 for RS-422 devices. RS-485 is upper compatible with RS-422. There are two connection t

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GLOBAL > PLC > SPH > Communication (Others)

Latest FAQ

When I write parameter to LonWorks module (NP1L-LW1) using support tool for a LonWorks (NP4N-LNDF), what is the required cable?
When using a communication module (NP1L-RS1/RS2/RS3/RS4/RS), the FB outputs R_STS 'C0' (Hardware error detected) during receiving. In this case, ho...
I use DeviceNet interface module (NP1L-RD1) under DeviceNet master (NP1L-DN1). How can I specify NP1L-RD1 in the system definition?
In the communication module (NP1L-RS1/RS2/RS3/RS4/RS5), is it possible to change communication parameter such as fixed length to variable length af...
With the FL-net module (NP1L-FL1/FL2/FL3), is there any way to confirm that the data sent from the node-A have actually been received by the node-B?

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FAQ within [ Communication (Others) ]

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With D300win, I used a non-procedural FB (_C_free) in a program for compilation and an error occurred. What is the cause of this problem?

One possible cause is that common FB _C_COM is not registered with the library. For communication-related expansion FBs including _C_FREE, register common... Show Detail
- No：1329
- Displayed Date：2023/04/25 19:00
- Updated DTM：2023/06/13 15:32
Does an RS-485 communication module (Type_ NP1L-RS1/RS4/RS5, etc.) support the MODBUS procedure?

The SX-Programmer Expert supports MODBUS communication (master function) using an FB. Communication with a MODBUS slave device is possible by using SPH_CP... Show Detail
- No：1380
- Displayed Date：2023/04/25 19:00
- Updated DTM：2023/06/13 15:45
I use DeviceNet interface module (NP1L-RD1) under DeviceNet master (NP1L-DN1). How can I specify NP1L-RD1 in the system definition?

In the system definition, group-type slave stations in any I/O configuration are registered as 'DeviceNet capsule.' In addition, the numbers of input and out... Show Detail
- No：1644
- Displayed Date：2023/04/25 19:00
What is the difference between RS-485 and RS-422 ?

RS-485 is upper compatible with RS-422. In general, RS-422 devices mainly use 4-wire connection method, while RS-485 devices mainly use 2-wire connection met... Show Detail
- No：1521
- Displayed Date：2023/04/25 19:00
What is necessary for MODBUS_RTU communication between SPH and an external device?

The following are necessary. 1) Hardware: General-purpose communication module (NP1L-RS1/RS2/RS3/RS4/RS5) whose firmware version is V42 or later ... Show Detail
- No：1469
- Displayed Date：2023/04/25 19:00
- Updated DTM：2023/06/09 13:29
For the initial setting of a general-purpose communication module with only one communication port such as NP1L-RS2 and NP1L-RS4, is it correct to ...

Set the port No. as described below. (1) For NP1L-RS2_ Set '0.' (2) For NP1L-RS4_ Set '1.' See the figure below for the setting for each type of genera... Show Detail
- No：1383
- Displayed Date：2023/04/25 19:00
- Updated DTM：2023/06/13 15:45
How does the FL-net module (Type_ NP1L-FL1/FL2/FL3) clear the error history recorded in each memory?

Once an error history is generated, it is retained internally within the FL-net module and is cleared when the power is turned off and turned on again or whe... Show Detail
- No：1567
- Displayed Date：2023/04/25 19:00
Can I use a commercially available hub for FL-net modules?

We recommend you use an unmanaged switch, without B.S protection that is an industrial hub fulfilling the conditions of use for FL-net. * What is 'B.S'?... Show Detail
- No：1465
- Displayed Date：2023/04/25 19:00
- Updated DTM：2023/06/09 13:28
With the FL-net module (NP1L-FL1/FL2/FL3), is there any way to confirm that the data sent from the node-A have actually been received by the node-B?

When the common memory system is used, this can be achieved by handshaking with an application using part of the link memory. Without handshaking, it is not... Show Detail
- No：1638
- Displayed Date：2023/04/25 19:00
NP1L-RS1/RS4/RS5 support RS-485. Can I use them for RS-422 devices?

Yes, you can use NP1L-RS1/RS4/RS5 for RS-422 devices. RS-485 is upper compatible with RS-422. There are two connection types for RS-422 devices: 2-wire conne... Show Detail
- No：1522
- Displayed Date：2023/04/25 19:00

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