Siemens SIMATIC S7-1200 - Page 1107

Communication processor and Modbus TCP
13.3 Point-to-point (PtP) communication
S7-1200 Programmable controller
System Manual, V4.2, 09/2016, A5E02486680-AK
1107
The "Properties" tab of the inspector wi
n-
dow displays the parameters of the s
e-
lected CM. Select "3964(R) configuration"
to e
dit the following parameters:
•
Priority (high or low)
•
Protocol parameters
– With block check (3964R)
– Use default values
Connection attempts
Transmission attempts
Character delay time
Acknowledgement delay
Parameter
Definition
Priority High or low: The CM will be either high or low and the communication partner must be the
opposite.
With block check (3964) If selected, 3964(R) communication employs transmission security by including a block
check character (BCC). If not selected transmission security does not include a block check
character.
Use default values If selected, 3964(R) uses default values for the following protocol parameters:
• Connection attempts
• Transmission attempts
• Character delay time
• Acknowledgement delay
If not selected, you can configure values for each of these parameters.
Connection attempts Number of connection attempts (default value: 6 connection attempts)
1 to 255
Transmission attempts Number of transmission attempts (default value: 6 connection attempts)
1 to 255
Character delay time Character delay time setting (depending on the set data transmission rate) (default value:
220 ms) 1 ms to 65535 ms
Acknowledgement delay Acknowledgment delay time setting (depending on the set data transmission rate) (default
value: 2000 ms when block check is enabled; 550 ms when block check is not enabled) 1
ms to 65535 ms
Note
With the exception of Priority, the protocol settings must be the same for the CM module and
the communication partner.