AioGetCntMaxChannels

Function

Retrieves the maximum number of the counter channels. This function supports multi-process.

Format

Ret = AioGetCntMaxChannels ( Id , CntMaxChannels )

Parameters

Id [ C, C++ : short ] [ Python : ctypes.c_short ]
Specifies the ID retrieved from AioInit.

CntMaxChannels [ C, C++ : short * ] [ Python : ctypes.POINTER(ctypes.c_short) ]
Specifies the address of the variable that stores the maximum number of channels.

Return values

Ret [ C, C++ : long ] [ Python : ctypes.c_long ]

Return values

Content

0

Normality completion

7

Execute AioResetDevice function because the device has recovered from standby mode

10001

Invalid Id was specified
Use the Id retrieved from AioInit to specify the Id in this function.

10002

AIO driver can't be called
At first, perform AioInit function.

15260

Pointer to CntMaxChannels is NULL
Specify the address of variable to parameter.

Remarks

The maximum number of channels is different according to device used.
CntMaxChannels becomes 0 for the device without counter functionality.
If the device is in operation, the function cannot be performed.

Specifications based on devices

AI-1664UG-PE

CntMaxChannels = 1, channel is shared with timer functionality.

AIO-163202G-PE
AIO-163202UG-PE
AIO-123202G-PE
AIO-123202UG-PE
AIO-163202F-PE
ADA16-32/2(PCI)F

CntMaxChannels = 2, channel is shared with timer functionality.

AIO-160802L-LPE
ADA16-8/2(LPCI)L
ADAI16-8/2(LPCI)L
AIO-160802LI-PE

CntMaxChannels = 1, channel is shared with timer functionality.

AI-1616L-LPE
AD16-64(LPCI)LA
AD16-16(LPCI)L
ADI16-16(LPCI)L
AI-1616LI-PE
AI-1664LA-LPE

CntMaxChannels = 1, channel is shared with timer functionality.

AO-1604L-LPE
DA16-16(LPCI)L
DA16-8(LPCI)L
DA16-4(LPCI)L
DAI16-4(LPCI)L
AO-1604LI-PE
AO-1608L-LPE
AO-1616L-LPE

CntMaxChannels = 1, channel is shared with timer functionality.

AIO-163202FX-USB

CntMaxChannels = 2

AIO-121602LN-USB
AIO-120802LN-USB

CntMaxChannels = 1

AI-1664LAX-USB

CntMaxChannels = 1

AO-1604LX-USB

CntMaxChannels = 1

Example

Retrieves the maximum number of counter channels.

C, C++

long Ret;
short CntMaxChannels;
Ret = AioGetCntMaxChannels ( Id , &CntMaxChannels );
 

Python

Ret = ctypes.c_long()
CntMaxChannels = ctypes.c_short()
Ret.value = caio.AioGetCntMaxChannels ( Id , ctypes.byref(CntMaxChannels) )