[Etherlab-users] 2 bits reading

Gavin Lambert gavin.lambert at tomra.com
Tue Oct 12 00:16:40 CEST 2021

Yes (assuming you meant incrementing the bit offset, not the byte address).  Or you can use EC_READ_U8 and then do the bit masking yourself.

For bit-aligned values, don't forget to provide a non-null pointer to receive the bit offset when registering the PDO.

Or since this is only a sync counter, if you're certain that you never miss any cycles you can fairly safely just ignore the second bit and simply use the LSB toggle as an indication that an update has occurred.

Gavin Lambert

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From: BUSSIERES Vincent
Sent: Tuesday, 12 October 2021 10:20
To: etherlab-users at etherlab.org
Subject: [Etherlab-users] 2 bits reading

Dear etherlab users, I bought a Beckhoff incremental encoder interface EL5102, as you can see below, some datas are written on two bits.
How can I read these 2 bits ?
May I read them by calling twice EC_READ_BIT with address increment ?

Index                   Name                                 Meaning                                                                                                                                    Data type           Flags      Default
60n2:0F           Input cycle counter       2-bit counter for synchronization (incremented only if a new value is present)    BIT2                 RO       0x00 (0dec)
Best regards

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