schmersal SD-I-U Serie Instructions De Montage page 10

Montage- und Anschlussanleitung / UNIVERSAL-Gateway für serielle Diagnose
Mounting and wiring instructions / UNIVERSAL gateway for serial diagnostics
Instructions de montage et de câblage / Passerelle UNIVERSEL pour diagnostic série
Reading acyclic data from the SD slave
english
In a permanently defined cycle, acyclic data of the individual SD slave can be requested through the 2 request bytes (fieldbus request byte 00 and byte 01)
and the data byte (fieldbus response byte 01).
The instruction byte defines, which data will be requested from a slave. The SD device, from which the data are requested, is defined in the
SD interface by means of the SD address byte. The response data of the SD slaves are saved in the fieldbus response byte 01.
The data request cycle is defined as follows:
1.) The control deletes the data byte before or after each command. A feedback signal is generated
through the response byte, indicating whether the data have been deleted or not
Hex FF Data deleted, acyclic data service ready
2.) The control first writes the SD address into the fieldbus request byte 01.
Then, the control writes the instruction byte into the fieldbus request byte 00
3.) The response data are made available in the fieldbus response byte 01 of the control.
The data byte can also include an error message as response:
Hex FE Instruction error, undefined instruction requested
Hex FD
Address error, invalid slave address for the selected instruction
or slave address of a unavailable SD slave selected
Table 1: overview of the instructions and response data
Instructions,
acyclic data request
Delete data byte
Read number of projected SD slaves
Read device category of the SD slave
Read hardware revision of the SD slave
Read software version of the SD slave
(high byte)
Read software version of the SD slave
(low byte)
The device category of a SD slave can be found in the mounting instructions of the device concerned.
The following device categories are defined:
Hex: 30 CSS 34, safety sensor
Hex: 31 AZM 200Z, solenoid interlock, „Z" variant
Hex: 32 MZM 100, solenoid interlock
Hex: 33 AZ 200, safety switch
Hex: 34 CSS 30S, safety sensor
Hex: 35 MZM 100B, solenoid interlock, „B" variant
Hex: 36 AZM 300B, solenoid interlock, „B" variant
Hex: 37 RSS 36, safety sensor
Hex: 38 AZM 300Z, solenoid interlock, „Z" variant
Hex: 39 RSS 16, safety sensor
Hex: 3A RSS 260, safety sensor
Instruction byte
SD address
fieldbus byte 00 fieldbus byte 01
(request) (request)
Hex: 00 Hex: xx
Hex: 01 Hex: 00
Hex: 02 Hex: 01 up to Hex: 1F
Hex: 03 Hex: 01 up to Hex: 1F
Hex: 04 Hex: 01 up to Hex: 1F
Hex: 05 Hex: 01 up to Hex: 1F
Data byte Data description
fieldbus byte 01
(response)
Hex: FF Data deleted, ready for new instruction
Hex: 01 up to Hex: 1F Number of projected SD slaves 1 – 31
Hex: 30 up to Hex: F8 SD slave device category (see below)
Hex: 41 up to Hex: 5A Hardware revision A –Z as ASCII characters
Hex: 00 up to Hex: 63 Software version, high byte: 0-99
Hex: 00 up to Hex: 63 Software version, low byte: 0-99
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