SIMATIC S7-400
Communication
Loadable drivers for CP 441-2 and CP 341
6/106
Siemens ST 70 · 2013
■
Overview
• Drivers for Modbus protocol with RTU message format;
communication as master or slave
• Downloadable onto CP 341 and CP 441-2
(6ES7 441-2AA04-0AE0)
■
Technical specifications
Parameterization software Loadable drivers
for CP 441-2 and CP 341
Type of license
Simple license, copy license
Target system SIMATIC CP 341, SIMATIC CP 441-2
Technical specifications
Modbus Master
• Modbus protocol with RTU format
• Master/slave coupling:
SIMATIC S7 is master
• Function codes implemented:
01, 02, 03, 04, 05, 06, 07, 08,
11,12,15,16
• No V.24 control and signal lines
• CRC polynomial: x
16
+ x
15
+ x
2
+1
• Interfaces: TTY (20 mA);
V.24 (RS 232 C);
X.27 (RS 422/485)
2-wire or 4-wire
• Receive mailbox specified on
BRCV
• Character delay time
3.5 characters or multiple thereof
• Broadcast message possible
Adjustable parameters • Transmission rate 300 bit/s up to
76800 bit/s (TTY up to 19200 bit/s)
• Character frame
• With/without RS 485 operation
for 2-wire connections
• With/without modem operation
(ignore smudge characters)
• Response monitoring time 100 ms
to 25.5 s in steps of 100 ms
• Factor for the character delay
time 1-10
• Default setting of receive line when
using the X.27 interface module
Modbus slave
• Modbus protocol with RTU format
• Master/slave coupling:
SIMATIC S7 is slave
• Function codes implemented: 01,
02, 03, 04, 05, 06, 08, 15, 16
• No V.24 control and signal line
• CRC polynomial: x
16
+ x
15
+ x
2
+1
• Interfaces: TTY (20 mA),
V.24 (RS 232C),
X.27 (RS 422/485)
2-wire or 4-wire
• Communications FB 180, instance
DB 180 (use of a multi-instance)
• Conversion of the Modbus data
address to S7 data areas. Data ar-
eas which can be processed: DB,
bit memories, outputs, inputs, tim-
ers, counters
• Character delay time
3.5 characters or multiple thereof
Adjustable parameters
• Transmission rate 300 bit/s up to
76800 bit/s (TTY up to 19200 bit/s)
• Character frame
• Slave address of CP (1 to 255)
• With/without RS 485 operation
for 2-wire connection
• With/without modem operation
(ignore smudge characters)
• Factor for the character delay
time 1-10
• Number of work DB
(for FB processing)
• Enabling of memory areas
for writing by the master
• Default setting of receive line when
using the X.27 interface module
• Conversion of Modbus addresses
to S7 data areas
Kap_06_eng.book Seite 106 Donnerstag, 2. Mai 2013 4:16 16
© Siemens AG 2013
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(264 paginas)
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