IAI America RCM-GW-PR - Manual (Page 111)

105
PfofiBus Gateway
(6) Actual assignment example
If the mode setting switch SW1 on the gateway unit is turned OFF (direct numerical specification
mode, 4 axes) for all axes, performing the I/O assignment explained in the preceding section would
result in the actual addresses looking like those specified below.
The S7-300 PLC guarantees consistency of I/O image and data at the data width (byte, word or
double words) defined in the program. If data consistency must be guaranteed throughout the I/O
areas, one way is to copy/write the I/O areas to the memory area (M area) using system function
blocks SFC14 and SFC15, and then specify the M area in the program.
For details on this method, refer to the applicable document published by HMS:
http://www.anybus.com/eng/upload/AnyBus-S-0012-Siemens%20Step7%20and%20AnyBus-S.pdf
PLC output
Gateway control word 0
Gateway control word 1
Axis (0) target position
Axis (0) push rate
Axis (0) speed
Axis (0) acceleration/deceleration
Axis (0) in-position band
Axis (0) control signal
Axis (1) target position
Axis (1) push rate
Axis (1) speed
Axis (1) acceleration/deceleration
Axis (1) in-position band
Axis (1) control signal
Axis (2) target position
Axis (2) push rate
Axis (2) speed
Axis (2) acceleration/deceleration
Axis (2) in-position band
Axis (2) control signal
Axis (3) target position
Axis (3) push rate
Axis (3) speed
Axis (3) acceleration/deceleration
Axis (3) in-position band
Axis (3) control signal
PLC input
Gateway status word 0
Gateway status word 1
Axis (0) status signal
Axis (0) current position
Cannot be used.
Cannot be used.
Axis (1) status signal
Axis (1) current position
Cannot be used.
Cannot be used.
Axis (2) status signal
Axis (2) current position
Cannot be used.
Cannot be used.
Axis (3) status signal
Axis (3) current position
Cannot be used.
Cannot be used.
Based on the above, the control signals, status signals, direct specification data and current
position of axis (3) will be addressed as shown in the table below.
Output signal/data Address Data length Address Data length Input signal/data name
Target position
Push rate
Speed
Acceleration/deceleration
In-position band
3 bytes
1 byte
3 bytes
1 byte
3 bytes
1 bit
1 bit
1 bit
1 bit
1 bit
1 bit
1 bit
1 bit
1 bit
1 bit
1 bit
1 bit
1 bit
1 bit
1 bit
1 bit
3 bytes Current position